Automatic merge from submit-queue

Use --regions instead of --region for gcloud list [resource]

gcloud has started complaining:
```
WARNING: Abbreviated flag [--region] will be disabled in release 132.0.0, use the full name [--regions].
WARNING: Abbreviated flag [--region] will be disabled in release 132.0.0, use the full name [--regions].
WARNING: Abbreviated flag [--region] will be disabled in release 132.0.0, use the full name [--regions].
```

We'll probably need to cherry-pick this, as otherwise the list-resources script will start failing at some point in the future.