FIX: public_file_server.enabled is false in test (#8192)

After a small conversation, we decided that we can set `public_file_server.enabled` to false in the `test` environment to have the same value as `production`.

config/environments/test.rb

@@ -10,7 +10,7 @@ Discourse::Application.configure do
   config.cache_classes = true
 
   # Configure static asset server for tests with Cache-Control for performance
-  config.public_file_server.enabled = true
+  config.public_file_server.enabled = false
 
   # don't consider reqs local so we can properly handle exceptions like we do in prd
   config.consider_all_requests_local       = false

spec/requests/uploads_controller_spec.rb

@@ -266,7 +266,6 @@ describe UploadsController do
     end
 
     it 'returns 200 when js file' do
-      ActionDispatch::FileHandler.any_instance.stubs(:match?).returns(false)
       upload = upload_file("test.js", "themes")
       get upload.url
       expect(response.status).to eq(200)