run torch::deploy test using pip install (#86507)
This PR runs the unit tests for [multipy](https://github.com/pytorch/multipy) in pytorch core such that we are able to make sure changes in core do not break multipy as adding `_prims` did.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86507
Approved by: https://github.com/anirbanr-fb-r2p, https://github.com/d4l3k
