Extract security_key_options endpoint to standalone controller (#38367)

config/routes.rb

@@ -76,8 +76,10 @@ Rails.application.routes.draw do
     namespace :auth do
       resource :setup, only: [:show, :update], controller: :setup
       resource :challenge, only: [:create]
-      get 'sessions/security_key_options', to: 'sessions#webauthn_options'
       post 'captcha_confirmation', to: 'confirmations#confirm_captcha', as: :captcha_confirmation
+      namespace :sessions do
+        resource :security_key_options, only: :show
+      end
     end
   end