Merge branch 'enable-ci-remove-ensure-stage-service' into 'master'

Enable `ci_remove_ensure_stage_service` by default

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154923



Merged-by: Avielle Wolfe <awolfe@gitlab.com>
Approved-by: Avielle Wolfe <awolfe@gitlab.com>
Co-authored-by: Laura Montemayor <lmontemayor@gitlab.com>

config/feature_flags/development/ci_remove_ensure_stage_service.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/389076
 milestone: '15.9'
 type: development
 group: group::pipeline authoring
-default_enabled: false
+default_enabled: true