scripts: Check .is_cuda only in non-C++ files (#7561)
The check-torchcuda.py today will search for all occurrences of .is_cuda
in the repository when a commit only modifies C++ headers and sources,
which I believe is not intended.
Check usage of .is_cuda only when a commit modifies any non-C++ file.
Signed-off-by: Junjie Mao <junjie.mao@linux.alibaba.com>
