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`

config/initializers/sidekiq.rb

@@ -9,7 +9,8 @@ end
 # Logs whenever a job is pulled off Redis for execution.
 class ChatwootDequeuedLogger
   def call(_worker, job, queue)
-    Sidekiq.logger.info("Dequeued #{job['class']} #{job['jid']} from #{queue}")
+    payload = job['args'].first
+    Sidekiq.logger.info("Dequeued #{job['wrapped']} #{payload['job_id']} from #{queue}")
     yield
   end
 end