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

app/models/channel/facebook_page.rb

@@ -63,4 +63,21 @@ class Channel::FacebookPage < ApplicationRecord
     Rails.logger.debug { "Rescued: #{e.inspect}" }
     true
   end
+
+  # TODO: We will be removing this code after instagram_manage_insights is implemented
+  def fetch_instagram_story_link(message)
+    k = Koala::Facebook::API.new(page_access_token)
+    result = k.get_object(message.source_id, fields: %w[story]) || {}
+    story_link = result['story']['mention']['link']
+    # If the story is expired then it raises the ClientError and if the story is deleted with valid story-id it responses with nil
+    delete_instagram_story(message) if story_link.blank?
+    story_link
+  rescue Koala::Facebook::ClientError => e
+    delete_instagram_story(message)
+  end
+
+  def delete_instagram_story(message)
+    message.update(content: I18n.t('conversations.messages.instagram_deleted_story_content'), content_attributes: {})
+    message.attachments.destroy_all
+  end
 end