chore: Move Twilio event processing to background job (#11094)

- Twilio events were being processed synchronously, leading to slow API
responses.
- This change moves Twilio event processing to a background job to
improve performance and align with how other events (e.g., WhatsApp) are
handled.

---------

Co-authored-by: Pranav <pranav@chatwoot.com>

spec/controllers/twilio/callbacks_controller_spec.rb

@@ -2,17 +2,27 @@ require 'rails_helper'
 
 RSpec.describe 'Twilio::CallbacksController', type: :request do
   include Rails.application.routes.url_helpers
-  let(:twilio_service) { instance_double(Twilio::IncomingMessageService) }
 
-  before do
-    allow(Twilio::IncomingMessageService).to receive(:new).and_return(twilio_service)
-    allow(twilio_service).to receive(:perform)
-  end
+  describe 'POST /twilio/callback' do
+    let(:params) do
+      {
+        'From' => '+1234567890',
+        'To' => '+0987654321',
+        'Body' => 'Test message',
+        'AccountSid' => 'AC123',
+        'SmsSid' => 'SM123'
+      }
+    end
 
-  describe 'GET /twilio/callback' do
-    it 'calls incoming message service' do
-      post twilio_callback_index_url, params: {}
-      expect(twilio_service).to have_received(:perform)
+    it 'enqueues the Twilio events job' do
+      expect do
+        post twilio_callback_index_url, params: params
+      end.to have_enqueued_job(Webhooks::TwilioEventsJob).with(params)
+    end
+
+    it 'returns no content status' do
+      post twilio_callback_index_url, params: params
+      expect(response).to have_http_status(:no_content)
     end
   end
 end