feat: Handle instagram test service (#11244)

This PR will handle the Instagram test events. We are using the last
created Instagram channel as the test channel since we don't have any
other channels for testing purposes at the time of Meta approval.



https://github.com/user-attachments/assets/98302b7a-d72c-4950-9660-861a5e08d55f

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

app/jobs/webhooks/instagram_events_job.rb

@@ -24,6 +24,11 @@ class Webhooks::InstagramEventsJob < MutexApplicationJob
   private
 
   def process_single_entry(entry)
+    if test_event?(entry)
+      process_test_event(entry)
+      return
+    end
+
     process_messages(entry)
   end
 
@@ -46,6 +51,20 @@ class Webhooks::InstagramEventsJob < MutexApplicationJob
     messaging[:message].present? && messaging[:message][:is_echo].present?
   end
 
+  def test_event?(entry)
+    entry[:changes].present?
+  end
+
+  def process_test_event(entry)
+    messaging = extract_messaging_from_test_event(entry)
+
+    Instagram::TestEventService.new(messaging).perform if messaging.present?
+  end
+
+  def extract_messaging_from_test_event(entry)
+    entry[:changes].first&.dig(:value) if entry[:changes].present?
+  end
+
   def instagram_id(messaging)
     if agent_message_via_echo?(messaging)
       messaging[:sender][:id]