feat: new background work process

This removes all previous dependencies on RabbitMQ and the need to run separate cron and requeueing processes.

spec/factories/webhook_factory.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :webhook do
+    server
+    name { "Example Webhook" }
+    url { "https://example.com" }
+    all_events { true }
+  end
+end