Clean up after fixing issue when admin changes email
What does this MR do and why?
Solves https://gitlab.com/gitlab-org/gitlab/-/issues/356264. There was an issue that if an admin changed the user email, that email was not added to the Emails
table. This was fixed in !81916 (merged). Now we need to run a clean up to fix affected users.
This clean up is almost identical to what was already run before in !76141 (merged) (here we don't need to finalize_background_migration
, as that was done already).
MR acceptance checklist
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