aws-appsync: imported resources from other regions using the current stack region

[ryanvaloris]

Describe the bug

When trying to import a Cognito UserPool to be used in an AppSync Graphql domain, the UserPool is configured with the region of the stack that is being deployed and disregards the region supplied in the ARN.

Expected Behavior

Using the construct below and assuming that this.stack is created in us-west-2:

return new GraphqlApi(this.stack, `api`, {
      name: `TheAPI`,
      schema: Schema.fromAsset('schema.graphql'),
      authorizationConfig: {
        defaultAuthorization: {
          authorizationType: AuthorizationType.USER_POOL,
          userPoolConfig: {
            userPool: UserPool.fromUserPoolArn(this.stack, 'CognitoUserPool', `arn:aws:cognito-idp:us-east-1:${this.awsAccountId}:userpool/${userPoolId}`),
            defaultAction: UserPoolDefaultAction.ALLOW
          }
        }
      },
      logConfig: {
        excludeVerboseContent: false,
        fieldLogLevel: FieldLogLevel.ALL
      },
      xrayEnabled: true
    });

I expected the UserPool to be linked to the UserPool created in us-east-1 per the ARN provided.

  "TheApi": {
   "Type": "AWS::AppSync::GraphQLApi",
   "Properties": {
    "AuthenticationType": "AMAZON_COGNITO_USER_POOLS",
    "Name": "TheApi",
    "UserPoolConfig": {
     "AwsRegion": "us-east-1",
     "DefaultAction": "ALLOW",
     "UserPoolId": {
      "Ref": "SomeId"
     }
     ...
  }

Current Behavior

However, the generated output shows us-west-2 as the region:

  "TheApi": {
   "Type": "AWS::AppSync::GraphQLApi",
   "Properties": {
    "AuthenticationType": "AMAZON_COGNITO_USER_POOLS",
    "Name": "TheApi",
    "UserPoolConfig": {
     "AwsRegion": "us-west-2",
     "DefaultAction": "ALLOW",
     "UserPoolId": {
      "Ref": "SomeId"
     }
     ...
  }

Reproduction Steps

build a new graphQl API with a UserPool from a different region

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

1.152.0

Framework Version

No response

Node.js Version

v16.10.0

OS

MacOS Monterey 12.3

Language

Typescript

Language Version

No response

Other information

No response

[ryanvaloris]

related #13691

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