Add role-specific user fabricators (#33437)

spec/controllers/admin/users/two_factor_authentications_controller_spec.rb

@@ -9,7 +9,7 @@ RSpec.describe Admin::Users::TwoFactorAuthenticationsController do
   let(:user) { Fabricate(:user) }
 
   before do
-    sign_in Fabricate(:user, role: UserRole.find_by(name: 'Admin')), scope: :user
+    sign_in Fabricate(:admin_user), scope: :user
   end
 
   describe 'DELETE #destroy' do