feat(region-info): update Metadata regions (#28166)

Update the list of regions where the CDK deploys the `AWS::CDK::Metadata` resource.

Author: aws-cdk-automation

packages/aws-cdk-lib/region-info/build-tools/metadata.ts

@@ -16,6 +16,8 @@ export const AWS_CDK_METADATA = new Set([
   'ap-southeast-1',
   'ap-southeast-2',
   'ca-central-1',
+  'cn-north-1',
+  'cn-northwest-1',
   'eu-central-1',
   'eu-north-1',
   'eu-south-1',