Iceberg REST catalogs gain UNREGISTER; Unity Catalog support is in private preview

Databricks contributed an UNREGISTER endpoint to the Apache Iceberg REST catalog specification. It removes a table from one catalog without touching its files and returns the latest metadata location, which another catalog then takes over with REGISTER, so a table has one managing catalog throughout the move. REGISTER and UNREGISTER on Unity Catalog are in private preview and available through the account team.

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