to backport: factor out send_new_note_notifications

app/services/notification_service.rb

@@ -190,6 +190,10 @@ class NotificationService
     # ignore gitlab service messages
     return true if note.cross_reference? && note.system?
 
+    send_new_note_notifications(note)
+  end
+
+  def send_new_note_notifications(note)
     notify_method = "note_#{note.to_ability_name}_email".to_sym
 
     recipients = NotificationRecipientService.new(note.project).build_new_note_recipients(note)