Restore the merge request "Clean up migration to populate commit users"
What does this MR do and why?
This migration was added in !72219 (merged), and reverted in !73035 (merged) due to it apparently timing out. While the job output suggests the issue is a connection error and not a timeout (see !72219 (comment 714405122)), there are a bunch of pending jobs left. I suspect that similar to production, Sidekiq got terminated along the way and jobs didn't get finished.
Once those jobs have been finished, this MR can be merged, as the migration ends up being a no-op.
MR acceptance checklist
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