[10.3] Prevent login with disabled OAuth providers See merge request gitlab/gitlabhq!2296 (cherry picked from commit 4936650427ffc88e6ee927aedbb2c724d24b094c) a0f9d222 Prevents login with disabled OAuth providers
Extracted `@request.env['devise.mapping'] = Devise.mappings[:user]` and `Rails.application.env_config['devise.mapping'] = Devise.mappings[:user]` in our tests into the helper method `set_devise_mapping`