Strict act-as mode for Dataform is now generally available (GA)

## Feature Feature [Strict act-as mode](https://cloud.google.com/dataform/docs/strict-act-as-mode)for Dataform is now[generally available](https://cloud.google.com/products#product-launch-stages)(GA). This feature enhances security by requiring users to have the`iam.serviceAccounts.actAs` permission on the service account used to run workflows, ensuring a more secure and predictable permissions model for your Dataform projects.