Remove c/pdist tests from _internal/common_utils.py (#33409)
Summary:
* remove brute_test from `torch/testing/_internal/common_utils.py`
* add these tests as internal tests to `test_torch.py`
CC ailzhang
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33409
Differential Revision: D19951729
Pulled By: ailzhang
fbshipit-source-id: b1126aaf26fa64a0f17cbb582dc8038b79cfe3eb
