fix transformers + torchao nvfp4 serialization (#45573)
Summary:
1. fix torchao NVFP4 serialization with transformers
2. add a test to cover the fix
While i'm here, also did the following bundled into this PR:
3. make the torchao serialization test have human readable names (easier
to debug)
4. fix the float8 test (update the expected output)
after this PR the test command for all torchao configs passes on an
NVIDIA B200
Test Plan:
```
RUN_SLOW=1 pytest tests/quantization/torchao_integration/test_torchao.py -k "Serialization" -s
```
Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>
