Add webhook `account.approved` (#22938)

* Webhook `account.approved` when preparing new user

* Update Webhook.EVENTS

app/models/user.rb

@@ -489,6 +489,7 @@ class User < ApplicationRecord
     BootstrapTimelineWorker.perform_async(account_id)
     ActivityTracker.increment('activity:accounts:local')
     UserMailer.welcome(self).deliver_later
+    TriggerWebhookWorker.perform_async('account.approved', 'Account', account_id)
   end
 
   def prepare_returning_user!

app/models/webhook.rb

@@ -15,6 +15,7 @@
 
 class Webhook < ApplicationRecord
   EVENTS = %w(
+    account.approved
     account.created
     report.created
   ).freeze