Remove refresh_only_existing_merge_requests_on_push FF

app/services/git/process_ref_changes_service.rb

@@ -75,8 +75,6 @@ module Git
     end
 
     def merge_request_branches_for(changes)
-      return if Feature.disabled?(:refresh_only_existing_merge_requests_on_push, default_enabled: true)
-
       @merge_requests_branches ||= MergeRequests::PushedBranchesService.new(project, current_user, changes: changes).execute
     end
   end

spec/services/git/process_ref_changes_service_spec.rb

@@ -190,18 +190,6 @@ RSpec.describe Git::ProcessRefChangesService do
 
         subject.execute
       end
-
-      context 'refresh_only_existing_merge_requests_on_push disabled' do
-        before do
-          stub_feature_flags(refresh_only_existing_merge_requests_on_push: false)
-        end
-
-        it 'refreshes all merge requests' do
-          expect(UpdateMergeRequestsWorker).to receive(:perform_async).exactly(3).times
-
-          subject.execute
-        end
-      end
     end
   end