feat(cli): garbage collect ecr assets (under --unstable flag)

packages/aws-cdk/lib/api/bootstrap/bootstrap-props.ts

@@ -1,7 +1,7 @@
 import { Tag } from '../../cdk-toolkit';
 
 export const BUCKET_NAME_OUTPUT = 'BucketName';
-export const REPOSITORY_NAME_OUTPUT = 'RepositoryName';
+export const REPOSITORY_NAME_OUTPUT = 'ImageRepositoryName';
 export const BUCKET_DOMAIN_NAME_OUTPUT = 'BucketDomainName';
 export const BOOTSTRAP_VERSION_OUTPUT = 'BootstrapVersion';
 export const BOOTSTRAP_VERSION_RESOURCE = 'CdkBootstrapVersion';