Backport of [NET-5622] build: consolidate Envoy version management to release/1.19.x #12707

Job	Run time
Get files changed and conditionally skip CI	27s
get-envoy-versions / Determine supported Envoy versions	6s
get-go-version / Determine Go toolchain version	6s
Setup	4s
Generate Envoy Job Matrices	4s
integration-test-with-deployer	3m 1s
dev-build / build	1m 6s
vault-integration-test (1.16.2)	3m 5s
vault-integration-test (1.15.6)	2m 38s
compatibility-integration-test	13m 18s
nomad-integration-test (v1.7.7)	2m 59s
vault-integration-test (1.14.10)	2m 29s
envoy-integration-test (server, case-property-override\|case-http\|case-ingress-gateway-peering-fai...	6m 37s
nomad-integration-test (v1.6.10)	2m 14s
envoy-integration-test (server, case-cfg-splitter-cluster-peering\|case-ingress-gateway-multiple-s...	5m 59s
nomad-integration-test (v1.5.17)	2m 27s
envoy-integration-test (server, case-api-gateway-http-simple\|case-terminating-gateway-subsets\|cas...	14m 37s
envoy-integration-test (server, case-terminating-gateway-simple\|case-cfg-splitter-peering-ingress...	15m 55s
envoy-integration-test (client, case-property-override\|case-http\|case-ingress-gateway-peering-fai...	6m 26s
envoy-integration-test (client, case-cfg-splitter-cluster-peering\|case-ingress-gateway-multiple-s...	6m 6s
envoy-integration-test (client, case-api-gateway-http-simple\|case-terminating-gateway-subsets\|cas...	5m 52s
envoy-integration-test (client, case-terminating-gateway-simple\|case-cfg-splitter-peering-ingress...	2m 17s
test-integrations-success	1s
	1h 37m 54s

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