rake task for removing unreferenced LFS objects from S3 bucket
Proposal
Customers sometimes end up with unreferenced LFS objects in their S3 bucket that they should be able to safely remove with a rake task.
Since sudo gitlab-rake gitlab:cleanup:orphan_lfs_files
does not cover this, it would make sense to have a new, additional rake task that can remove unreferenced LFS objects from S3 buckets.
cc @sean_carroll cc @andr3