feat: extending lock to single conversation to meta inbox (#9104)

This change introduces the ability to lock conversations to a single thread for Instagram and facebook messages within the Meta inbox, mirroring existing functionality in WhatsApp and SMS inboxes.

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

spec/factories/facebook_message/incoming_fb_text_message.rb

@@ -11,6 +11,21 @@ FactoryBot.define do
     initialize_with { attributes }
   end
 
+  factory :mocked_message_text, class: Hash do
+    transient do
+      sender_id { '3383290475046708' }
+    end
+
+    initialize_with do
+      { messaging: { sender: { id: sender_id },
+                     recipient: { id: '117172741761305' },
+                     message: { mid: 'm_KXGKDUpO6xbVdAmZFBVpzU1AhKVJdAIUnUH4cwkvb_K3iZsWhowDRyJ_DcowEpJjncaBwdCIoRrixvCbbO1PcA',
+                                text: 'facebook message' } } }
+    end
+
+    # initialize_with { attributes }
+  end
+
   factory :message_deliveries, class: Hash do
     messaging do
       { sender: { id: '3383290475046708' },