[WIP] Backport external table clone on top of 1.9.latest#1189

mi-volodin wants to merge 3 commits intodatabricks:1.9.latestdatabricks/dbt-databricks:1.9.latestfrom

mi-volodin:1.9_backport_external_tables_clonemi-volodin/dbt-databricks:1.9_backport_external_tables_cloneCopy head branch name to clipboard