Wait for requests before continuing

Otherwise async requests will happen while factory_bot fixtures are
created, causing Rails to lock, and the spec to hang.

See https://gitlab.com/gitlab-org/gitlab/-/issues/337039

spec/features/triggers_spec.rb

@@ -17,6 +17,8 @@ RSpec.describe 'Triggers', :js do
     @project.add_guest(guest_user)
 
     visit project_settings_ci_cd_path(@project)
+
+    wait_for_requests
   end
 
   shared_examples 'triggers page' do