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/models/attachment_spec.rb

@@ -9,4 +9,23 @@ RSpec.describe Attachment, type: :model do
       expect(attachment.download_url).not_to be_nil
     end
   end
+
+  describe 'push_event_data for instagram story mentions' do
+    let(:instagram_message) { create(:message, :instagram_story_mention) }
+
+    before do
+      # stubbing the request to facebook api during the message creation
+      stub_request(:get, %r{https://graph.facebook.com/.*}).to_return(status: 200, body: {
+        story: { mention: { link: 'http://graph.facebook.com/test-story-mention', id: '17920786367196703' } },
+        from: { username: 'Sender-id-1', id: 'Sender-id-1' },
+        id: 'instagram-message-id-1234'
+      }.to_json, headers: {})
+    end
+
+    it 'returns external url as data and thumb urls' do
+      external_url = instagram_message.attachments.first.external_url
+      expect(instagram_message.attachments.first.push_event_data[:data_url]).to eq external_url
+      expect(instagram_message.attachments.first.push_event_data[:thumb_url]).to eq external_url
+    end
+  end
 end