chore(sidekiq): log ActiveJob class and job_id on dequeue (#12704)

## Context

Sidekiq logs only showed the Sidekiq wrapper class and JID, which wasn’t
helpful when debugging ActiveJobs.

## Changes

- Updated `ChatwootDequeuedLogger` to log the actual `ActiveJob class`
and `job_id` instead of the generic Sidekiq wrapper and JID.

> Example
> ```
> Dequeued ActionMailer::MailDeliveryJob
123e4567-e89b-12d3-a456-426614174000 from default
> ```

- Remove sidekiq worker and unify everything to `ActiveJob`

app/services/messages/send_email_notification_service.rb

@@ -12,7 +12,7 @@ class Messages::SendEmailNotificationService
     # the worker never manages to clean up.
     return unless Redis::Alfred.set(conversation_mail_key, message.id, nx: true, ex: 1.hour.to_i)
 
-    ConversationReplyEmailWorker.perform_in(2.minutes, conversation.id, message.id)
+    ConversationReplyEmailJob.set(wait: 2.minutes).perform_later(conversation.id, message.id)
   end
 
   private