Quarantine spec global_search_spec due to flakiness

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/201841

spec/features/global_search_spec.rb

@@ -36,7 +36,7 @@ RSpec.describe 'Global search' do
     end
   end
 
-  it 'closes the dropdown on blur', :js do
+  it 'closes the dropdown on blur', :js, quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/201841' do
     fill_in 'search', with: "a"
     dropdown = find('.js-dashboard-search-options')