chore: fix sla email notifications (#9192)

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

enterprise/app/services/sla/evaluate_applied_sla_service.rb

@@ -50,6 +50,7 @@ class Sla::EvaluateAppliedSlaService
   end
 
   def get_last_message_id(conversation)
+    # TODO: refactor the method to fetch last message without reply
     conversation.messages.where(message_type: :incoming).last&.id
   end