feat: new background work process

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

app/services/webhook_delivery_service.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class WebhookDeliveryService
+
+  def initialize(webhook_delivery:)
+    @webhook_delivery = webhook_delivery
+  end
+
+  # TODO: move the logic from WebhookDelivery#deliver in to this service.
+  #
+  def call
+    if @webhook_delivery.deliver
+      log "Succesfully delivered"
+    else
+      log "Delivery failed"
+    end
+  end
+
+end