Update C++ torch::nn parity table, and temporarily disable C++ API parity test (#28117)
Summary:
This PR updates `test/cpp_api_parity/parity-tracker.md` to reflect our progress on C++ `torch::nn` parity. It also disables the C++ API parity test temporarily, and as the next step I will refactor the parity test to make it simpler.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28117
Differential Revision: D17957948
Pulled By: yf225
fbshipit-source-id: 1dd836c25665f57ba8efc6d1abf671a95c03eff7
