File cleanup/organization in controllers/concerns (#27846)

app/controllers/concerns/auth/registration_spam_concern.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module Auth::RegistrationSpamConcern
+  extend ActiveSupport::Concern
+
+  def set_registration_form_time
+    session[:registration_form_time] = Time.now.utc
+  end
+end