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/jobs/conversation_reply_email_job.rb

@@ -0,0 +1,15 @@
+class ConversationReplyEmailJob < ApplicationJob
+  queue_as :mailers
+
+  def perform(conversation_id, last_queued_id)
+    conversation = Conversation.find(conversation_id)
+
+    if conversation.messages.incoming&.last&.content_type == 'incoming_email'
+      ConversationReplyMailer.with(account: conversation.account).reply_without_summary(conversation, last_queued_id).deliver_later
+    else
+      ConversationReplyMailer.with(account: conversation.account).reply_with_summary(conversation, last_queued_id).deliver_later
+    end
+
+    Redis::Alfred.delete(format(::Redis::Alfred::CONVERSATION_MAILER_KEY, conversation_id: conversation.id))
+  end
+end