Remove minimal access feature flag

config/feature_flags/licensed/minimal_access_role.yml

----
-name: minimal_access_role
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40942
-rollout_issue_url:
-group: group::access
-type: licensed
-default_enabled: true

config/initializers/0_inject_feature_flags.rb

@@ -17,7 +17,6 @@ if Gitlab.ee? && Gitlab.dev_or_test_env?
     feature_flags_related_issues
     group_wikis
     swimlanes
-    minimal_access_role
   ].to_set
 
   # First, we validate a list of overrides to ensure that these overrides