Fix flaky tests in groups and project mirrors specs

ee/spec/controllers/admin/groups_controller_spec.rb

@@ -42,6 +42,8 @@ describe Admin::GroupsController do
   context 'PUT update' do
     context 'no license' do
       it 'does not update the project_creation_level successfully' do
+        stub_licensed_features(project_creation_level: false)
+
         expect do
           post :update, id: group.to_param, group: { project_creation_level: ::EE::Gitlab::Access::NO_ONE_PROJECT_ACCESS }
         end.not_to change { group.reload.project_creation_level }

ee/spec/requests/projects/mirrors_controller_spec.rb

@@ -20,7 +20,7 @@ describe Projects::MirrorsController do
         project: {
         mirror: '1',
         import_url: '',
-        mirror_user_id: '1',
+        mirror_user_id: user.id,
         mirror_trigger_builds: '0'
       }