Fix `online_garbage_collection_spec.rb` QA failure

qa/qa/specs/features/browser_ui/5_package/online_garbage_collection_spec.rb

@@ -2,7 +2,8 @@
 
 module QA
   RSpec.describe 'Package' do
-    describe 'Container Registry Online Garbage Collection', :registry_gc, only: { subdomain: %i[pre] } do
+    # TODO: Remove :requires_admin when the `Runtime::Feature.enable` method call is removed
+    describe 'Container Registry Online Garbage Collection', :registry_gc, :requires_admin, only: { subdomain: %i[pre] } do
       let(:group) { Resource::Group.fabricate_via_api! }
 
       let(:imported_project) do
@@ -64,6 +65,8 @@ module QA
       end
 
       before do
+        Runtime::Feature.enable(:paginatable_namespace_drop_down_for_project_creation)
+
         Flow::Login.sign_in
 
         imported_project