Add a way to skip lowering to nvprims (#85811)
This PR adds `skip_ops` argument to `TorchRefsNvfuserCapabilityMode` and `NvfuserPrimsMode` which is an iterable of function names to be skipped in the translation to nvprims process.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85811
Approved by: https://github.com/mruberry, https://github.com/jjsjann123
