Skip dtensor ops on CPU-only runner due to flaky timeout (#98868)
`distributed/_tensor/test_dtensor_ops` is still flaky in trunk with a curious timeout issue, for example https://hud.pytorch.org/pytorch/pytorch/commit/ce4df4cc596aa10534ac6d54912f960238264dfd. It seems that the test just hang without any failure. The root cause is unclear. On the other hang, https://github.com/pytorch/pytorch/issues/98816 might offer a solution for this. Anyway, I'm disable the test on CPU for now while the investigation is being done.
The test is still being run on CUDA-available runner because it's not flaky there.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98868
Approved by: https://github.com/clee2000
