Return the noteable in Note#touch_noteable

This allows EE to re-use the object, making it easier to trigger
indexing of the noteable.

app/models/note.rb

@@ -401,6 +401,9 @@ class Note < ActiveRecord::Base
       end
     noteable_object&.touch
+
+    # We return the noteable object so we can re-use it in EE for ElasticSearch.
+    noteable_object
   end
   def banzai_render_context(field)