enable upload test stats on PR (#59567)
Summary:
Enable test stats upload on PR.
Uses PR number as part of the key so that it can be properly indexed and later parsed if PR has been merged/closed.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59567
Reviewed By: ejguan
Differential Revision: D28943654
Pulled By: walterddr
fbshipit-source-id: f3a7a25ae14c6877067e1b347e3a8658d80d1544
