ci: Remove unused files since the logic was moved to a dedicated gem

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/132781



Merged-by: Felipe Artur <fcardozo@gitlab.com>
Approved-by: Alina Mihaila <amihaila@gitlab.com>
Approved-by: Felipe Artur <fcardozo@gitlab.com>
Co-authored-by: Rémy Coutable <remy@rymai.me>