[nn][utils] Preserve requires_grad from original weight and bias in fuse conv/linear bn weights (#89100)
Summary:
att, previously we just call nn.Parameter which will have requires_grad=True by default, after
this PR we will preserve the requires_grad
Test Plan:
python test/test_nn.py TestFusionUtils
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Differential Revision: [D41343694](https://our.internmc.facebook.com/intern/diff/D41343694)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89100
Approved by: https://github.com/ngimel
