Merge pull request #19879 from bboe/RedirectTestCleanup

Remove unused WorkshopsController class in redirect_test.

actionpack/test/controller/redirect_test.rb

 require 'abstract_unit'
 
-class WorkshopsController < ActionController::Base
-end
-
 class RedirectController < ActionController::Base
   # empty method not used anywhere to ensure methods like
   # `status` and `location` aren't called on `redirect_to` calls