move kernel launch checks from `torch.testing` to `torch.testing._internal.check_kernel_launches` (#60862)
Summary:
The fact that these functions are only used in a single test might be a good enough reason to move them to that module.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60862
Reviewed By: H-Huang
Differential Revision: D31141354
Pulled By: mruberry
fbshipit-source-id: 6ce1f721b88620c5f46222ad1b942bc689f0a3e0
