Change new accounts to use new ActivityPub numeric ID scheme (#36365)

spec/requests/oauth/userinfo_spec.rb

@@ -19,7 +19,7 @@ RSpec.describe 'OAuth Userinfo Endpoint' do
       expect(response.content_type).to start_with('application/json')
       expect(response.parsed_body).to include({
         iss: root_url,
-        sub: account_url(account),
+        sub: ActivityPub::TagManager.instance.uri_for(account),
         name: account.display_name,
         preferred_username: account.username,
         profile: short_account_url(account),