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/inboxes/fetch_imap_email_inboxes_job_spec.rb

@@ -10,7 +10,7 @@ RSpec.describe Inboxes::FetchImapEmailInboxesJob, type: :job do
 
   it 'enqueues the job' do
     expect { described_class.perform_later }.to have_enqueued_job(described_class)
-      .on_queue('low')
+      .on_queue('scheduled_jobs')
   end
 
   context 'when called' do

spec/jobs/inboxes/fetch_imap_emails_job_spec.rb

@@ -19,7 +19,7 @@ RSpec.describe Inboxes::FetchImapEmailsJob, type: :job do
 
   it 'enqueues the job' do
     expect { described_class.perform_later }.to have_enqueued_job(described_class)
-      .on_queue('low')
+      .on_queue('scheduled_jobs')
   end
 
   context 'when imap fetch new emails' do