[modes] make python arg parser also check for python key (#91573)
Fixes #90652
Previously, we had assumed that the only way to call `handle_torch_function_no_python_arg_parser` was through the Python key. This is no longer true with FakeTensor. Specifically `_like` functions will call `.device()` on FakeTensors when the args list is being parsed. In order to respect that the mode stack shouldn't run when the python key is off, this just adds that a check that the python key is on/the torch_function equivalent to that function
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91573
Approved by: https://github.com/ezyang
