Add aliases for old workers

This will allow already enqueued jobs to finish. These aliases can be
removed once the queue has drained

app/sidekiq/check_job.rb

@@ -56,3 +56,5 @@ def self.run(check_id, priority: "high", synchronous: false)
     end
   end
 end
+
+CheckWorker = CheckJob

app/sidekiq/cleanup_job.rb

@@ -28,3 +28,5 @@ def old_batches
     Batch.where(id: BatchCheck.select(:batch_id).where(check: old_checks))
   end
 end
+
+CleanupWorker = CleanupJob

app/sidekiq/webhook_job.rb

@@ -49,3 +49,5 @@ def generate_signature(body, key)
     OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new("sha1"), key, body)
   end
 end
+
+WebhookWorker = WebhookJob