allow user to star/unstar broadcast recordings

spec/factories/broadcast_recordings.rb

@@ -5,5 +5,9 @@ FactoryBot.define do
     asset_uid "asset_uid"
     asset_playback_uid "asset_playback_uid"
     hidden { false }
+
+    trait :with_random_asset_uid do
+      sequence(:asset_uid, 'a')
+    end
   end
 end