Remove feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/175803



Merged-by: Luke Duncalfe <lduncalfe@gitlab.com>
Approved-by: Evan Read <eread@gitlab.com>
Approved-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Approved-by: Sam Word <sword@gitlab.com>
Reviewed-by: Justin Ho Tuan Duong <hduong@gitlab.com>
Co-authored-by: Luke Duncalfe <lduncalfe@eml.cc>