Merge branch 'led/360784-remove-remaining-backend-code' into 'master'

Remove remaining old ruby code for usage quotas - pipelines

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/105723



Merged-by: Aleksei Lipniagov <alipniagov@gitlab.com>
Approved-by: Edgars Bralitis <ebralitis@gitlab.com>
Approved-by: Roy Zwambag <rzwambag@gitlab.com>
Approved-by: Aleksei Lipniagov <alipniagov@gitlab.com>
Co-authored-by: Sheldon Led <sheldonled@gitlab.com>