feat: Add a setting to keep conversations pending on bot failures (#13512)

Adds an account-level setting `keep_pending_on_bot_failure` to control
whether conversations should move from pending to open when agent bot
webhooks fail.

Some users experience occasional message drops and don't want
conversations to automatically reopen due to transient bot failures.
This setting gives accounts control over that behavior. This is a
temporary setting which will be removed in future once a proper fix for
it is done, so it is not added in the UI.

lib/webhooks/trigger.rb

@@ -36,16 +36,21 @@ class Webhooks::Trigger
 
     case @webhook_type
     when :agent_bot_webhook
-      conversation = message.conversation
-      return unless conversation&.pending?
-
-      conversation.open!
-      create_agent_bot_error_activity(conversation)
+      update_conversation_status(message)
     when :api_inbox_webhook
       update_message_status(error)
     end
   end
 
+  def update_conversation_status(message)
+    conversation = message.conversation
+    return unless conversation&.pending?
+    return if conversation&.account&.keep_pending_on_bot_failure
+
+    conversation.open!
+    create_agent_bot_error_activity(conversation)
+  end
+
   def create_agent_bot_error_activity(conversation)
     content = I18n.t('conversations.activity.agent_bot.error_moved_to_open')
     Conversations::ActivityMessageJob.perform_later(conversation, activity_message_params(conversation, content))