R1:54006f481729

Stop "Mute Notifications" on Bulk Jobs from fataling

Summary:
See <https://discourse.phabricator-community.org/t/unhandled-exception-muting-completed-bulk-jobs/2449>. Bulk Jobs have an "edge" table but currently do not support edge transactions. Add support.

This stops "Mute Notifications" from fataling.

The action probably doesn't do what the reporting user expects (it stops edits to the job object from sending notifications; it does not stop the edits the job performs from sending notifications) but I…