ns for fx: move linear activation test case to new API (#53777)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53777
Moves linear activation test case to new NS API
Test Plan:
```
python test/test_quantization.py TestFXNumericSuiteCoreAPIsModels.test_compare_activations_linear
```
Imported from OSS
Reviewed By: hx89
Differential Revision: D26967107
fbshipit-source-id: 83c4401b2bf79d15227b7fb3e59c54276ec5626b
