Dataform workflows, BigQuery notebooks, pipelines, and data preparations

## Breaking Breaking [Dataform workflows](https://cloud.google.com/dataform/docs/sql-workflows),[BigQuery notebooks](https://cloud.google.com/bigquery/docs/orchestrate-notebooks),[pipelines](https://cloud.google.com/bigquery/docs/schedule-pipelines), and[data preparations](https://cloud.google.com/bigquery/docs/orchestrate-data-preparations)are enforcing strict act-as mode at the project level. To avoid failures and maintain automatic releases, you must use custom service accounts instead of the default Dataform service agent across all repositories. You must also grant the Service Account User role (`roles/iam.serviceAccountUser`) to the default Dataform service agent and relevant principals. For more information and to verify act-as permissions, see[Use strict act-as mode](https://cloud.google.com/dataform/docs/strict-act-as-mode).