Resolve "Rollout of `track_and_raise_delete_source_errors`"
requested to merge 382440-feature-flag-rollout-of-track_and_raise_delete_source_errors-2 into master
What does this MR do and why?
When we fail to delete the branch, we should raise this as an exception so that the worker will be rerun.
This FF has been turned on for over 3 weeks.
Related to #382440 (closed)
Edited by Marc Shaw