Remove flaky spec

There's no more need to check that we're not running extra queries here
because we're now always returning an empty array for the pipelines
attribute.

spec/requests/api/project_packages_spec.rb

@@ -260,16 +260,6 @@
 
           expect(json_response['pipelines']).to be_empty
         end
-
-        it 'does not result in additional queries', quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/439528' do # rubocop:disable Layout/LineLength -- We prefer to keep it on a single line, for simplicity sake
-          control = ActiveRecord::QueryRecorder.new do
-            get api(package_url, user)
-          end
-
-          expect do
-            get api(package_url, user)
-          end.not_to exceed_query_limit(control).with_threshold(4)
-        end
       end
 
       context 'project is public' do