Merge branch 'default-epic_new_issue-ff' into 'master'

Defaulted epic_new_issue feature flag to on

See merge request gitlab-org/gitlab!22833

changelogs/unreleased/default-epic_new_issue-ff.yml

+---
+title: Add ability to create an issue in an epic
+merge_request: 22833
+author:
+type: added

ee/app/controllers/groups/epics_controller.rb

@@ -19,7 +19,7 @@ class Groups::EpicsController < Groups::ApplicationController
   before_action do
     push_frontend_feature_flag(:roadmap_graphql, @group)
     push_frontend_feature_flag(:vue_issuable_epic_sidebar, @group)
-    push_frontend_feature_flag(:epic_new_issue, @group)
+    push_frontend_feature_flag(:epic_new_issue, @group, default_enabled: true)
   end
 
   def index