[ONNX] Fix 'prim::PackPadded' shape inference (#91829)
In `peephole` pass, user nodes of output of `prim::PackPadded` are modified to consume
the input of `prim::PackPadded` instead. Hence the logic in shape type inference. However
only the first output requires this workaround.
Fixes #91528
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91829
Approved by: https://github.com/titaiwangms
