stop lint from getting submodules
Fixes #ISSUE_NUMBER
Helps w/ #68543
Tested via https://github.com/pytorch/pytorch/pull/75688 b/c had to change the source of the action
- Stop lint from getting submodules -> reduce lint job time by 1-2 minutes, two exceptions are clang-tidy (which fetches the submodules later on its own) and flake8-py3 (no clue why)
- stop shellcheck from checking out pytorch twice?
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75686
Approved by: https://github.com/janeyx99
