Revert "DEV: enable cors to all cdn get requests from workbox. (#10684)" (#11076)

This reverts commit e3de45359f9bc7a71d9b8045a7e369fd0cf8f433.

We need to improve out strategy by adding a cache breaker with this change ... some assets on CDNs and clients may have incorrect CORS headers which can cause stuff to break.

spec/requests/application_controller_spec.rb

@@ -737,17 +737,6 @@ RSpec.describe ApplicationController do
       end
     end
 
-    context "cdn requests" do
-      before do
-        GlobalSetting.stubs(:cdn_url).returns("https://www.example.com/")
-      end
-
-      it "should block the dynamic routes" do
-        get "/"
-        expect(response.status).to eq(404)
-      end
-    end
-
     context "set_locale_from_accept_language_header enabled" do
       context "accept-language header differs from default locale" do
         before do