Dataform workflows and BigQuery pipelines now support automated metadata

## Feature Feature Dataform workflows and BigQuery pipelines now support automated metadata enrichment for BigQuery tables and views, allowing you to define semantic metadata directly in SQLX configurations for synchronization with the Knowledge Catalog. For more information, see[Add metadata for Knowledge Catalog](https://cloud.google.com/dataform/docs/create-tables#add-metadata). This feature is in[Preview](https://cloud.google.com/products#product-launch-stages).