ns for fx: move shadow activations conv test to new API (#53818)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53818
Moves testing of conv for shadow activations to new NS API
Test Plan:
```
python test/test_quantization.py TestFXNumericSuiteCoreAPIsModels.test_compare_shadow_activations_conv
```
Imported from OSS
Reviewed By: hx89
Differential Revision: D26982732
fbshipit-source-id: 9e8709a76363fbcdf84413e5d4a6c8a0889cb97b
