Enable auto git gc on GitLab repositories created as mirrors

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Proposal

As mentioned in this Ultimate customer's ticket (internal link), mirrored repositories on SaaS are hitting the max repository size limit, which is preventing them from running housekeeping tasks on the repositories without intervention from support.

The proposal then is to enable automatic git gc on mirrored repositories that hit this limit, or enable housekeeping to work even if the repository has hit or exceeded the max repository size on SaaS.