Revert upstream changes triggering LB panic (#3426)

This reverts the following upstream PRs:
hashicorp/terraform-provider-aws#35671
hashicorp/terraform-provider-aws#35678
as a quick fix to mitigate
#3421 until we root-cause it.

Details on my findings so far:
#3421 (comment)
It looks to me like the issue originates somewhere in our handling of
nulls/empty in the bridge, so seems unlikely to get fixed today.

It also adds a test for LB listeners. I've verified that the test
triggers the panic without the patches and that the patches resolve it.

examples/examples_nodejs_test.go

@@ -538,6 +538,18 @@ func TestRegress2555(t *testing.T) {
 	integration.ProgramTest(t, &test)
 }
 
+func TestRegress3421(t *testing.T) {
+	test := getJSBaseOptions(t).
+		With(integration.ProgramTestOptions{
+				Dir: "regress-3421",
+				SkipRefresh: true,
+			},
+		)
+	// Disable envRegion mangling
+	test.Config = nil
+	integration.ProgramTest(t, &test)
+}
+
 func getJSBaseOptions(t *testing.T) integration.ProgramTestOptions {
 	envRegion := getEnvRegion(t)
 	baseJS := integration.ProgramTestOptions{

examples/regress-3421/.gitignore

@@ -0,0 +1,2 @@
+/bin/
+/node_modules/

examples/regress-3421/Pulumi.yaml

@@ -0,0 +1,7 @@
+name: regress-3421
+runtime: nodejs
+description: A minimal AWS TypeScript Pulumi program
+config:
+  pulumi:tags:
+    value:
+      pulumi:template: aws-typescript

examples/regress-3421/index.ts

@@ -0,0 +1,50 @@
+import * as aws from "@pulumi/aws";
+
+const vpc = new aws.ec2.Vpc("main", { cidrBlock: "10.0.0.0/16" });
+
+const currentRegion = aws.getRegion({})
+const subnet = new aws.ec2.Subnet("main", {
+    vpcId: vpc.id,
+    cidrBlock: "10.0.12.0/24",
+    availabilityZone: currentRegion.then(region => region.name + "a")
+});
+
+const subnet2 = new aws.ec2.Subnet("subnet2", {
+    vpcId: vpc.id,
+    cidrBlock: "10.0.5.0/24",
+    availabilityZone: currentRegion.then(region => region.name + "b")
+});
+
+const secGroup = new aws.ec2.SecurityGroup("allowTls", {
+    description: "Allow TLS inbound traffic and all outbound traffic",
+    vpcId: vpc.id,
+    tags: {
+        Name: "allow_tls",
+    },
+});
+
+const loadbalancer = new aws.lb.LoadBalancer("payload-lb", {
+    loadBalancerType: "application",
+    securityGroups: [secGroup.id],
+    subnets: [subnet.id, subnet2.id],
+    internal: true,
+});
+
+const targetGroup = new aws.lb.TargetGroup("payload-tg", {
+    port: 80,
+    protocol: "HTTP",
+    targetType: "ip",
+    vpcId: vpc.id,
+});
+
+new aws.lb.Listener("payload-lb-listner-http", {
+loadBalancerArn: loadbalancer.arn,
+port: 80,
+protocol: "HTTP",
+defaultActions: [
+    {
+    type: "forward",
+    targetGroupArn: targetGroup.arn,
+    },
+],
+});

examples/regress-3421/package.json

@@ -0,0 +1,12 @@
+{
+    "name": "regress-3421",
+    "main": "index.ts",
+    "devDependencies": {
+        "@types/node": "^18"
+    },
+    "dependencies": {
+        "@pulumi/pulumi": "^3.0.0",
+        "@pulumi/aws": "^6.0.0",
+        "@pulumi/awsx": "^2.0.2"
+    }
+}

examples/regress-3421/tsconfig.json

@@ -0,0 +1,18 @@
+{
+    "compilerOptions": {
+        "strict": true,
+        "outDir": "bin",
+        "target": "es2016",
+        "module": "commonjs",
+        "moduleResolution": "node",
+        "sourceMap": true,
+        "experimentalDecorators": true,
+        "pretty": true,
+        "noFallthroughCasesInSwitch": true,
+        "noImplicitReturns": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.ts"
+    ]
+}