Actually report mac stats (#57511)
Summary:
Give credentials to pytorch mac tests in CI so that test reports can be uploaded to S3.
Master runs have not been uploaded to S3 as the credentials were missing. https://app.circleci.com/pipelines/github/pytorch/pytorch/311990/workflows/2b2fbb72-b613-4986-8842-eccd93e7cdae/jobs/12945609/steps
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57511
Reviewed By: samestep
Differential Revision: D28165041
Pulled By: janeyx99
fbshipit-source-id: a4a9c793029838bdab41af19dbce1c8c49f7122d
