feat(api-gateway-v2): Add method to generate flexible execute-api ARN (…

…#28400)

This PR adds the arnForExecuteApi method, previously available only for REST API constructs, to both WebSocket and HTTP API constructs. 

Closes #23301 

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk-testing/framework-integ/test/aws-apigatewayv2/test/http/integ.api.js.snapshot/aws-cdk-aws-apigatewayv2.template.json

@@ -0,0 +1,55 @@
+{
+ "Resources": {
+  "HttpApiF5A9A8A7": {
+   "Type": "AWS::ApiGatewayV2::Api",
+   "Properties": {
+    "Name": "HttpApi",
+    "ProtocolType": "HTTP"
+   }
+  },
+  "HttpApiDefaultStage3EEB07D6": {
+   "Type": "AWS::ApiGatewayV2::Stage",
+   "Properties": {
+    "ApiId": {
+     "Ref": "HttpApiF5A9A8A7"
+    },
+    "AutoDeploy": true,
+    "StageName": "$default"
+   }
+  }
+ },
+ "Parameters": {
+  "BootstrapVersion": {
+   "Type": "AWS::SSM::Parameter::Value<String>",
+   "Default": "/cdk-bootstrap/hnb659fds/version",
+   "Description": "Version of the CDK Bootstrap resources in this environment, automatically retrieved from SSM Parameter Store. [cdk:skip]"
+  }
+ },
+ "Rules": {
+  "CheckBootstrapVersion": {
+   "Assertions": [
+    {
+     "Assert": {
+      "Fn::Not": [
+       {
+        "Fn::Contains": [
+         [
+          "1",
+          "2",
+          "3",
+          "4",
+          "5"
+         ],
+         {
+          "Ref": "BootstrapVersion"
+         }
+        ]
+       }
+      ]
+     },
+     "AssertDescription": "CDK bootstrap stack version 6 required. Please run 'cdk bootstrap' with a recent version of the CDK CLI."
+    }
+   ]
+  }
+ }
+}