Use commit stats from viable/strict instead of nightlies for sharding (#59727)
Summary:
Currently, not all of CI runs on nightlies, so it's better to use viable/strict.
For example, current 11.1 test jobs do not get to use automatic sharding because of the lack of stats: https://app.circleci.com/jobs/github/pytorch/pytorch/14010983?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59727
Reviewed By: heitorschueroff
Differential Revision: D29004910
Pulled By: janeyx99
fbshipit-source-id: eb0c54a7e7947decba8134a1d67e4b0434151a06
