Enable the :ci_config_feature_flag_correctness by default

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/171067



Merged-by: Laura Montemayor <lmontemayor@gitlab.com>
Approved-by: Laura Montemayor <lmontemayor@gitlab.com>
Co-authored-by: Rajendra Kadam <rkadam@gitlab.com>