Also fixes https://gitlab.com/gitlab-org/gitlab/-/issues/222432
Fixes a bunch of TODO'ed rubocop violations encountered during
work on https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40088

This cleans up all TODO'ed rubocop violations encountered during
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40088
except for the namespaced class ones, which would be very invasive.