Log runtime autotuning timing to scuba (#141919)
Summary:
See test plan in internal diff [D66679369](https://our.internmc.facebook.com/intern/diff/D66679369)
X-link: https://github.com/pytorch/pytorch/pull/141919
Approved by: https://github.com/jamesjwu, https://github.com/ezyang
Reviewed By: huydhn
Differential Revision: D67218561
Pulled By: masnesral
fbshipit-source-id: a331b201264a6d8880fb2f36472dcadde513540f
