Merge branch 'jv-spec-workhorse' into 'master'

Remove stub for obsolete feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/105640



Merged-by: Etienne Baqué <ebaque@gitlab.com>
Approved-by: Ian Anderson <ianderson@gitlab.com>
Approved-by: Etienne Baqué <ebaque@gitlab.com>
Co-authored-by: Jacob Vosmaer <jacob@gitlab.com>