Merge branch 'fix/sm/move-callback-route-google_api-auth-callback-for-oauth-under' into 'master'

Move callback route(`google_api/auth/callback`) for Oauth under `-`

Closes #38911

See merge request gitlab-org/gitlab-ce!14802

config/routes/google_api.rb

-namespace :google_api do
-  resource :auth, only: [], controller: :authorizations do
-    match :callback, via: [:get, :post]
+scope '-' do
+  namespace :google_api do
+    resource :auth, only: [], controller: :authorizations do
+      match :callback, via: [:get, :post]
+    end
   end
 end

lib/gitlab/path_regex.rb

@@ -33,7 +33,6 @@ module Gitlab
       explore
       favicon.ico
       files
-      google_api
       groups
       health_check
       help