Push `missing_mr_security_scan_types` feature flag to frontend

ee/app/controllers/ee/projects/merge_requests_controller.rb

@@ -10,6 +10,7 @@ module EE
 
         before_action only: [:show] do
           push_frontend_feature_flag(:anonymous_visual_review_feedback)
+          push_frontend_feature_flag(:missing_mr_security_scan_types, @project)
         end
 
         before_action :whitelist_query_limiting_ee_merge, only: [:merge]