[pytorch][te] Do not merge Tensor[] variant of aten::where into fusion group (#48063)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48063
The TE fuser does not know how to construct a list of Tensors.
Test Plan: new unit test
Reviewed By: eellison
Differential Revision: D25007234
fbshipit-source-id: 1a8ffdf5ffecb39a727357799ed32df8f53150d6
