re-enable kernel launch checks in CI (#77841)
I just saw that I forgot to update the lint workflow in #60862. Unfortunately, [CI doesn't go red](https://github.com/pytorch/pytorch/runs/6503564764#step:9:11):
```
+ python torch/testing/_check_kernel_launches.py
+ tee /home/runner/actions-runner/_work/pytorch/pytorch/cuda_kernel_launch_checks.txt
python: can't open file '/home/runner/actions-runner/_work/pytorch/pytorch/torch/testing/_check_kernel_launches.py': [Errno 2] No such file or directory
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/77841
Approved by: https://github.com/janeyx99
