Add entry for distributed tests to CODEOWNERS. (#34637)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34637
ghstack-source-id: 100003837
Test Plan: waitforbuildbot
Differential Revision: D20404552
fbshipit-source-id: a7f35beb8b78ad25e5cd000cd940dd7e94cc65de
