Add retry:0 for controller specs n+1

As a workaround for https://gitlab.com/gitlab-org/gitlab-ce/issues/64116

spec/controllers/projects/merge_requests_controller_spec.rb

@@ -878,7 +878,7 @@ describe Projects::MergeRequestsController do
         expect(control_count).to be <= 137
       end
-      it 'has no N+1 issues for environments', :request_store do
+      it 'has no N+1 issues for environments', :request_store, retry: 0 do
         # First run to insert test data from lets, which does take up some 30 queries
         get_ci_environments_status