Migrates our credentials to upload metrics statistics to managed IAM
credentials in order to make it easier to know where the credentials are
coming from and to make it easier to add more permissions / less
permissions later on

Signed-off-by: Eli Uriegas <eliuriegasfb.com>

Pull Request resolved: https://github.com/pytorch/pytorch/pull/73811

Approved by: https://github.com/kit1980, https://github.com/janeyx99