Sanitize and sandbox toot embeds (#9552)

app/controllers/api/web/embeds_controller.rb

@@ -10,6 +10,7 @@ class Api::Web::EmbedsController < Api::Web::BaseController
     render json: status, serializer: OEmbedSerializer, width: 400
   rescue ActiveRecord::RecordNotFound
     oembed = FetchOEmbedService.new.call(params[:url])
+    oembed[:html] = Formatter.instance.sanitize(oembed[:html], Sanitize::Config::MASTODON_OEMBED) if oembed[:html].present?
 
     if oembed
       render json: oembed