Follow-up from "Rake task gitlab:cleanup:orphan_lfs_files should clear the cached value or repository size"

The following discussion from !32541 (merged) should be addressed:

• @splattael started a discussion:

  Non-blocking: Any reason why the spec is in ee/spec while the code is in lib/gitlab? 🤔

  It was added back in !21747 (merged) but I couldn't find the reason why it's this way. Can you help me with my confusion? 🤓