Merge branch 'fix-autoloading-issue' into 'master'

Don't require `API::API` in routes

Closes #18312.

See merge request !8045

config/routes.rb

 require 'sidekiq/web'
 require 'sidekiq/cron/web'
-require 'api/api'
 require 'constraints/group_url_constrainer'
 Rails.application.routes.draw do