Housekeeping and repository cleanup should prune unreferenced LFS objects

Problem to solve

Using repository cleanup (https://docs.gitlab.com/ee/user/project/repository/reducing_the_repo_size_using_git.html#using-the-bfg-repo-cleaner) triggers housekeeping, but git gc doesn't prune loose LFS objects. This means the repo size can't be reduced by removing LFS objects.

Further details

Feature flag: :cleanup_lfs_during_gc

Proposal

• When running repository cleanup, prune LFS objects included in the uploaded commit map.

• Ensure notifications take into account LFS space/storage

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