buck1 can't properly handle '/' on rule names, so fixing 'impl/cow/context' and 'core/impl/cow/context_test' build rules (#101552)
This is because PR #101510 can't be landed due to the author not have linked a github account to his internal meta account.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/101552
Approved by: https://github.com/DanilBaibak
