Merge branch 'el-clean-up-ci_require_credit_card_on_trial_plan-ff' into 'master'

Clean up ci_require_credit_card_on_trial_plan feature flag

Closes gitlab-org/modelops/anti-abuse/team-tasks#763

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167139



Merged-by: Fabio Pitino <fpitino@gitlab.com>
Approved-by: Sharmad Nachnolkar <snachnolkar@gitlab.com>
Approved-by: Artur Fedorov <afedorov@gitlab.com>
Approved-by: Ian Anderson <ianderson@gitlab.com>
Approved-by: Fabio Pitino <fpitino@gitlab.com>
Reviewed-by: Fabio Pitino <fpitino@gitlab.com>
Co-authored-by: Eugie Limpin <elimpin@gitlab.com>