fix: Automatically remove expired story mention (#5300)

When a user mentions the connected Instagram page in a story, the story's content is downloaded in Chatwoot, then if the user deletes the story, the content persists in the platform.

fixes: #5258

spec/factories/channel/instagram_channel.rb

@@ -6,5 +6,9 @@ FactoryBot.define do
     user_access_token { SecureRandom.uuid }
     page_id { SecureRandom.uuid }
     account
+
+    before :create do |_channel|
+      WebMock::API.stub_request(:post, 'https://graph.facebook.com/v3.2/me/subscribed_apps')
+    end
   end
 end

spec/factories/messages.rb

@@ -8,6 +8,18 @@ FactoryBot.define do
     content_type { 'text' }
     account { create(:account) }
 
+    trait :instagram_story_mention do
+      content_attributes { { image_type: 'story_mention' } }
+      after(:build) do |message|
+        unless message.inbox.instagram?
+          message.inbox = create(:inbox, account: message.account,
+                                         channel: create(:channel_instagram_fb_page, account: message.account, instagram_id: 'instagram-123'))
+        end
+        attachment = message.attachments.new(account_id: message.account_id, file_type: :image, external_url: 'https://www.example.com/test.jpeg')
+        attachment.file.attach(io: File.open(Rails.root.join('spec/assets/avatar.png')), filename: 'avatar.png', content_type: 'image/png')
+      end
+    end
+
     after(:build) do |message|
       message.sender ||= message.outgoing? ? create(:user, account: message.account) : create(:contact, account: message.account)
       message.inbox ||= message.conversation&.inbox || create(:inbox, account: message.account)