chore: Reorganize Sidekiq Queues (#6976)

- Rearrange and reprioritize current sidekiq queues
- Trim the unnecessary queues

ref: https://linear.app/chatwoot/issue/CW-1480/chore-run-all-sidekiq-jobs-async

spec/jobs/agents/destroy_job_spec.rb

@@ -17,7 +17,7 @@ RSpec.describe Agents::DestroyJob, type: :job do
   it 'enqueues the job' do
     expect { job }.to have_enqueued_job(described_class)
       .with(account, user)
-      .on_queue('default')
+      .on_queue('low')
   end
 
   describe '#perform' do