Tighten up remove_old regex from gitlab backup manager.
EE Counterpart of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14333/commits#note_40858898
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
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Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together