Forcing UTC on Mac circleci jobs (#17516)
Summary:
And adding timestamps to linux build jobs
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17516
Differential Revision: D14244533
Pulled By: pjh5
fbshipit-source-id: 26c38f59e0284c99f987d69ce6a2c2af9116c3c2
