Default test cases feature flag to on

Default quality_test_cases feature flag to on

ee/app/controllers/projects/quality/test_cases_controller.rb

@@ -9,7 +9,7 @@ class Projects::Quality::TestCasesController < Projects::ApplicationController
   before_action :authorize_create_issue!, only: [:new]
 
   before_action do
-    push_frontend_feature_flag(:quality_test_cases, project)
+    push_frontend_feature_flag(:quality_test_cases, project, default_enabled: true)
   end
 
   feature_category :quality_management
@@ -45,7 +45,7 @@ class Projects::Quality::TestCasesController < Projects::ApplicationController
   private
 
   def verify_test_cases_flag!
-    render_404 unless Feature.enabled?(:quality_test_cases, project)
+    render_404 unless Feature.enabled?(:quality_test_cases, project, default_enabled: true)
   end
 
   def test_cases_finder

ee/app/services/quality_management/test_cases/create_service.rb

@@ -43,7 +43,7 @@ module QualityManagement
       end
 
       def can_create_test_cases?
-        project.feature_available?(:quality_management) && Feature.enabled?(:quality_test_cases, project)
+        project.feature_available?(:quality_management) && Feature.enabled?(:quality_test_cases, project, default_enabled: true)
       end
     end
   end

ee/app/views/layouts/nav/_test_cases_link.html.haml

-- return unless Feature.enabled?(:quality_test_cases, project)
+- return unless Feature.enabled?(:quality_test_cases, project, default_enabled: true)
 - return unless project.feature_available?(:quality_management)
 - return unless can?(current_user, :read_issue, project)
 

ee/changelogs/unreleased/default_quality_test_cases_to_on.yml

+---
+title: Introduce quality test cases
+merge_request: 47948
+author:
+type: added

ee/config/feature_flags/development/quality_test_cases.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/241983
 milestone: '13.4'
 type: development
 group: group::certify
-default_enabled: false
+default_enabled: true