Update httputil.WriteError to log upper level stack
Update httputil.WriteError to log upper level stack

PiperOrigin-RevId: 295863322
Change-Id: Idf220e302d0faccfbcd65926b67bef493ba5e226

GoogleCloudPlatform/healthcare-federated-access-services,GoogleCloudPlatform/healthcare-federated-access-services,GoogleCloudPlatform/healthcare-federated-access-services,GoogleCloudPlatform/healthcare-federated-access-services