chore(cleanup): Delete sentiment feature (#9304)

- The feature is unused, removing it for now, will bring it back with better models later.

app/models/conversation.rb

@@ -310,5 +310,4 @@ class Conversation < ApplicationRecord
 end
 
 Conversation.include_mod_with('Concerns::Conversation')
-Conversation.include_mod_with('SentimentAnalysisHelper')
 Conversation.prepend_mod_with('Conversation')

app/models/message.rb

@@ -269,7 +269,6 @@ class Message < ApplicationRecord
     reopen_conversation
     notify_via_mail
     set_conversation_activity
-    update_message_sentiments
     dispatch_create_events
     send_reply
     execute_message_template_hooks
@@ -406,10 +405,6 @@ class Message < ApplicationRecord
     conversation.update_columns(last_activity_at: created_at)
     # rubocop:enable Rails/SkipsModelValidations
   end
-
-  def update_message_sentiments
-    # override in the enterprise ::Enterprise::SentimentAnalysisJob.perform_later(self)
-  end
 end
 
 Message.prepend_mod_with('Message')