Remove gtest_prod.h from TP agent. (#50766)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50766
This header breaks certain builds since it causes PyTorch to depend
on gtest.
ghstack-source-id: 119991167
Test Plan: waitforbuildbot
Reviewed By: mrshenli
Differential Revision: D25960810
fbshipit-source-id: ceaaad499f6f363ef35c6623475ae8f191d86171
