fix(bigtable): Log warning on background task failure instead of exception - #18193

fix(bigtable): Log warning on background task failure instead of exception#18193

daniel-sanche wants to merge 4 commits into

googleapis:maingoogleapis/google-cloud-python:mainfrom

daniel-sanche:fix_bigtable_sync_thread_errordaniel-sanche/google-cloud-python:fix_bigtable_sync_thread_errorCopy head branch name to clipboard