feat(appsync): add ownerContact property to the GraphqlApi (#31585)

### Issue # (if applicable)

Closes #<issue number here>.

### Reason for this change

Because there is no `ownerContact` prop on the aws-appsync graphqlapi.ts L2 layer.

### Description of changes

Added `ownerContact` prop on the aws-appsync graphqlapi.ts L2 layer.

### Description of how you validated changes

Added both of unit test and integration test.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

Author: yasuaki640

packages/@aws-cdk-testing/framework-integ/test/aws-appsync/test/integ.appsync-owner-contact.js.snapshot/apiDefaultTestDeployAssert018781F2.assets.json

@@ -0,0 +1,85 @@
+{
+ "Resources": {
+  "OwnerContactCA72337C": {
+   "Type": "AWS::AppSync::GraphQLApi",
+   "Properties": {
+    "AuthenticationType": "API_KEY",
+    "Name": "OwnerContact",
+    "OwnerContact": "test-owner-contact"
+   }
+  },
+  "OwnerContactSchemaD692A0DE": {
+   "Type": "AWS::AppSync::GraphQLSchema",
+   "Properties": {
+    "ApiId": {
+     "Fn::GetAtt": [
+      "OwnerContactCA72337C",
+      "ApiId"
+     ]
+    },
+    "Definition": "type test {\n  version: String!\n}\ntype Query {\n  getTests: [test]!\n}\ntype Mutation {\n  addTest(version: String!): test\n}\n"
+   }
+  },
+  "OwnerContactDefaultApiKeyF4AD6E80": {
+   "Type": "AWS::AppSync::ApiKey",
+   "Properties": {
+    "ApiId": {
+     "Fn::GetAtt": [
+      "OwnerContactCA72337C",
+      "ApiId"
+     ]
+    }
+   },
+   "DependsOn": [
+    "OwnerContactSchemaD692A0DE"
+   ]
+  },
+  "OwnerContactNoneDS6E9204C8": {
+   "Type": "AWS::AppSync::DataSource",
+   "Properties": {
+    "ApiId": {
+     "Fn::GetAtt": [
+      "OwnerContactCA72337C",
+      "ApiId"
+     ]
+    },
+    "Name": "NoneDS",
+    "Type": "NONE"
+   }
+  }
+ },
+ "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."
+    }
+   ]
+  }
+ }
+}