Add tests for Error Pages in VS and VSRs

tests/data/virtual-server-error-pages/standard/virtual-server.yaml

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+apiVersion: k8s.nginx.org/v1
+kind: VirtualServer
+metadata:
+  name: virtual-server
+spec:
+  host: virtual-server.example.com
+  upstreams:
+  - name: backend2
+    service: backend2-svc
+    port: 80
+  - name: backend1
+    service: backend1-svc
+    port: 80
+  routes:
+  - path: "/backend1"
+    errorPages:
+      - codes: [502]
+        redirect:
+          code: 307
+          url: ${scheme}://virtual-server.example.com/error.html
+    action:
+      pass: backend1
+  - path: "/backend2"
+    errorPages:
+      - codes: [502]
+        return:
+          code: 207
+          type: application/json
+          body: |
+            {\"status\": \"${upstream_status}\",\"message\":\"Forbidden\"}
+          headers:
+          - name: x-debug-original-status
+            value: ${upstream_status}
+    action:
+      pass: backend2

tests/data/virtual-server-error-pages/virtual-server-invalid.yaml

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+apiVersion: k8s.nginx.org/v1
+kind: VirtualServer
+metadata:
+  name: virtual-server
+spec:
+  host: virtual-server.example.com
+  upstreams:
+  - name: backend2
+    service: backend2-svc
+    port: 80
+  - name: backend1
+    service: backend1-svc
+    port: 80
+  routes:
+  - path: "/backend1"
+    errorPages:
+      - codes: [308]
+        redirect:
+          code: 101
+          url: /relative/path/url.html
+    action:
+      pass: backend1
+  - path: "/backend2"
+    errorPages:
+      - codes: [502]
+        return:
+          code: 100
+          type: ±!@£$%^&*()
+          body: |
+            {\"status\": \"${status}\",\"message\":\"Forbidden\"}
+          headers:
+          - name: x-debug-original-status
+            value: ${schema}
+    action:
+      pass: backend2

tests/data/virtual-server-error-pages/virtual-server-matches.yaml

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+apiVersion: k8s.nginx.org/v1
+kind: VirtualServer
+metadata:
+  name: virtual-server
+spec:
+  host: virtual-server.example.com
+  upstreams:
+  - name: backend2
+    service: backend2-svc
+    port: 80
+  - name: backend4-stable
+    service: backend4-stable-svc
+    port: 80
+  - name: backend1-future
+    service: backend1-future-svc
+    port: 80
+  - name: backend3-deprecated
+    service: backend3-deprecated-svc
+    port: 80
+  routes:
+  - path: "/backend1"
+    matches:
+      - conditions:
+          - header: x-version
+            value: future
+        action:
+          pass: backend1-future
+      - conditions:
+          - header: x-version
+            value: deprecated
+        action:
+          pass: backend3-deprecated
+    action:
+      pass: backend4-stable
+    errorPages:
+      - codes: [502, 404]
+        redirect:
+          code: 307
+          url: ${scheme}://virtual-server.example.com/error.html
+  - path: "/backend2"
+    errorPages:
+      - codes: [502]
+        return:
+          code: 207
+          type: application/json
+          body: |
+            {\"status\": \"${upstream_status}\",\"message\":\"Forbidden\"}
+          headers:
+          - name: x-debug-original-status
+            value: ${upstream_status}
+    action:
+      pass: backend2

tests/data/virtual-server-error-pages/virtual-server-splits.yaml

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+apiVersion: k8s.nginx.org/v1
+kind: VirtualServer
+metadata:
+  name: virtual-server
+spec:
+  host: virtual-server.example.com
+  upstreams:
+  - name: backend2
+    service: backend2-svc
+    port: 80
+  - name: backend1-v1
+    service: backend1-svc-v1
+    port: 80
+  - name: backend1-v2
+    service: backend1-svc-v2
+    port: 80
+  routes:
+  - path: "/backend1"
+    splits:
+      - weight: 90
+        action:
+          pass: backend1-v1
+      - weight: 10
+        action:
+          pass: backend1-v2
+    errorPages:
+      - codes: [502]
+        redirect:
+          code: 308
+          url: ${scheme}://virtual-server.example.com/error.html
+  - path: "/backend2"
+    errorPages:
+      - codes: [502]
+        return:
+          code: 207
+          type: application/json
+          body: |
+            {\"status\": \"${upstream_status}\",\"message\":\"Forbidden\"}
+          headers:
+          - name: x-debug-original-status
+            value: ${upstream_status}
+    action:
+      pass: backend2

tests/data/virtual-server-error-pages/virtual-server-updated.yaml

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+apiVersion: k8s.nginx.org/v1
+kind: VirtualServer
+metadata:
+  name: virtual-server
+spec:
+  host: virtual-server.example.com
+  upstreams:
+  - name: backend2
+    service: backend2-svc
+    port: 80
+  - name: backend1
+    service: backend1-svc
+    port: 80
+  routes:
+  - path: "/backend1"
+    errorPages:
+      - codes: [502, 404]
+        redirect:
+          url: ${scheme}://virtual-server.example.com/error_${http_x_forwarded_proto}.html
+    action:
+      pass: backend1
+  - path: "/backend2"
+    errorPages:
+      - codes: [502]
+        return:
+          body: |
+            Hello World!
+    action:
+      pass: backend2

tests/data/virtual-server-route-error-pages/route-multiple-invalid.yaml

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+apiVersion: k8s.nginx.org/v1
+kind: VirtualServerRoute
+metadata:
+  name: backends
+spec:
+  host: virtual-server-route.example.com
+  upstreams:
+  - name: backend1
+    service: backend1-svc
+    port: 80
+  - name: backend3
+    service: backend3-svc
+    port: 80
+  subroutes:
+  - path: "/backends/backend1"
+    errorPages:
+      - codes: [308]
+        redirect:
+          code: 101
+          url: /relative/path/url.html
+    action:
+      pass: backend1
+  - path: "/backends/backend3"
+    errorPages:
+      - codes: [502]
+        return:
+          code: 100
+          type: ±!@£$%^&*()
+          body: |
+            {\"status\": \"${status}\",\"message\":\"Forbidden\"}
+          headers:
+          - name: x-debug-original-status
+            value: ${schema}
+    action:
+      pass: backend3

tests/data/virtual-server-route-error-pages/route-multiple-matches.yaml

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+apiVersion: k8s.nginx.org/v1
+kind: VirtualServerRoute
+metadata:
+  name: backends
+spec:
+  host: virtual-server-route.example.com
+  upstreams:
+  - name: backend1
+    service: backend1-svc
+    port: 80
+  - name: backend4-stable
+    service: backend4-stable-svc
+    port: 80
+  - name: backend1-future
+    service: backend1-future-svc
+    port: 80
+  - name: backend3-deprecated
+    service: backend3-deprecated-svc
+    port: 80
+  subroutes:
+  - path: "/backends/backend1"
+    matches:
+      - conditions:
+          - argument: arg1
+            value: v1
+        action:
+          pass: backend1-future
+      - conditions:
+          - argument: arg1
+            value: v2
+        action:
+          pass: backend3-deprecated
+    errorPages:
+      - codes: [502, 404]
+        redirect:
+          code: 307
+          url: ${scheme}://virtual-server-route.example.com/error.html
+    action:
+      pass: backend4-stable
+  - path: "/backends/backend3"
+    errorPages:
+      - codes: [502]
+        return:
+          code: 207
+          type: application/json
+          body: |
+            {\"status\": \"${upstream_status}\",\"message\":\"Forbidden\"}
+          headers:
+            - name: x-debug-original-status
+              value: ${upstream_status}
+    action:
+      pass: backend3-deprecated

tests/data/virtual-server-route-error-pages/route-multiple-splits.yaml

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+apiVersion: k8s.nginx.org/v1
+kind: VirtualServerRoute
+metadata:
+  name: backends
+spec:
+  host: virtual-server-route.example.com
+  upstreams:
+  - name: backend1-v1
+    service: backend1-svc-v1
+    port: 80
+  - name: backend1-v2
+    service: backend1-svc-v2
+    port: 80
+  - name: backend3
+    service: backend3-svc
+    port: 80
+  subroutes:
+  - path: "/backends/backend1"
+    splits:
+      - weight: 90
+        action:
+          pass: backend1-v1
+      - weight: 10
+        action:
+          pass: backend1-v2
+    errorPages:
+      - codes: [502]
+        redirect:
+          code: 308
+          url: ${scheme}://virtual-server-route.example.com/error.html
+  - path: "/backends/backend3"
+    errorPages:
+      - codes: [502]
+        return:
+          code: 207
+          type: application/json
+          body: |
+            {\"status\": \"${upstream_status}\",\"message\":\"Forbidden\"}
+          headers:
+            - name: x-debug-original-status
+              value: ${upstream_status}
+    action:
+      pass: backend3

tests/data/virtual-server-route-error-pages/route-multiple-updated.yaml

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+apiVersion: k8s.nginx.org/v1
+kind: VirtualServerRoute
+metadata:
+  name: backends
+spec:
+  host: virtual-server-route.example.com
+  upstreams:
+  - name: backend1
+    service: backend1-svc
+    port: 80
+  - name: backend3
+    service: backend3-svc
+    port: 80
+  subroutes:
+  - path: "/backends/backend1"
+    errorPages:
+      - codes: [502, 404]
+        redirect:
+          url: ${scheme}://virtual-server-route.example.com/error_${http_x_forwarded_proto}.html
+    action:
+      pass: backend1
+  - path: "/backends/backend3"
+    errorPages:
+      - codes: [502]
+        return:
+          body: |
+            Hello World!
+    action:
+      pass: backend3