Add callback_url/acct information for Sidekiq PuSH workers Exception. (#4281)

* Add destination informations to exception on SubscribeWorker and DeliveryWorker.

* Simplify delivery error message.

* Prevent changing Exception type...

* fix typo.

app/workers/pubsubhubbub/delivery_worker.rb

@@ -16,6 +16,8 @@ class Pubsubhubbub::DeliveryWorker
     @subscription = Subscription.find(subscription_id)
     @payload = payload
     process_delivery unless blocked_domain?
+  rescue => e
+    raise e.class, "Delivery failed for #{subscription&.callback_url}: #{e.message}"
   end
 
   private