fix(codecommit): take the region and account of an imported Repositor…

…y from its ARN (#13066)

To align it with how other resources work, for example
[S3 Buckets](https://github.com/aws/aws-cdk/blob/c6256992902fc4237ceb9f965e970e2c2ef00777/packages/%40aws-cdk/aws-s3/lib/bucket.ts#L1285-L1286). 

Fixes #13025

----

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

packages/@aws-cdk/aws-codecommit/lib/repository.ts

@@ -310,7 +310,10 @@ export class Repository extends RepositoryBase {
       public readonly repositoryCloneUrlGrc = makeCloneUrl(stack, repositoryName, 'grc', region);
     }
 
-    return new Import(scope, id);
+    return new Import(scope, id, {
+      account: arn.account,
+      region,
+    });
   }
 
   public static fromRepositoryName(scope: Construct, id: string, repositoryName: string): IRepository {

packages/@aws-cdk/aws-codecommit/test/test.codecommit.ts

@@ -104,6 +104,9 @@ export = {
 
       test.deepEqual(stack.resolve(repo.repositoryCloneUrlGrc), 'codecommit::us-west-2://my-repo');
 
+      test.deepEqual(repo.env.account, '585695036304');
+      test.deepEqual(repo.env.region, 'us-west-2');
+
       test.done();
     },