Fix named tensor build by enabling tensor.is_pinned and removing support for clone() (#23597)
Summary:
`is_pinned` was moved to native_functions.yaml, disabling it for named
tensors. This PR re-enables its usage for named tensors.
I wrote a named inference rule for torch.clone(), but something happened
to it. Disable it for now so we can get the namedtensor ci to be green.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23597
Test Plan: - run tests [namedtensor ci]
Differential Revision: D16581771
Pulled By: zou3519
fbshipit-source-id: 498018cdc55e269bec80634b8c0a63ba5c72914b
