Use full path of user's avatar in webhooks

app/models/user.rb

@@ -825,7 +825,7 @@ class User < ActiveRecord::Base
     {
       name: name,
       username: username,
-      avatar_url: avatar_url
+      avatar_url: avatar_url(only_path: false)
     }
   end
 

changelogs/unreleased/34339-user_avatar-url-in-push-event-webhook-json-payload-is-relative-should-be-absolute.yml

+---
+title: Use full path of user's avatar in webhooks
+merge_request: 13401
+author: Vitaliy @blackst0ne Klachkov