Add test that bias gradient is properly tested in same_two_models (#88995)
See
https://github.com/pytorch/pytorch/pull/88629#issuecomment-1313850324
for why this got broken.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88995
Approved by: https://github.com/albanD
