Quarantine a flaky spec in ee/spec/features/epics/shortcuts_epic_spec.rb

Signed-off-by: Rémy Coutable <remy@rymai.me>

ee/spec/features/epics/shortcuts_epic_spec.rb

@@ -41,7 +41,7 @@ describe 'Epic shortcuts', :js do
       wait_for_requests
     end
 
-    it "quotes the selected text" do
+    it "quotes the selected text", :quarantine do
       select_element('.note-text')
       find('body').native.send_key('r')