fix: unset column tags before dropping a column#1597
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Resolves #1323
Description
Dropping a column that carries a governed tag fails with CANNOT_DROP_TAGGED_COLUMN, because Unity Catalog requires the tag be removed before the column. This unsets any tags on the columns being dropped (via on_schema_change='sync_all_columns') before issuing DROP COLUMNS, so tagged columns can be dropped cleanly.
Checklist
CHANGELOG.mdand added information about my change to the "dbt-databricks next" section./dbt-databricks-pr-ready(AI agent skill in.claude/skills/) and addressed its merge-readiness feedback