[torch::deploy] add gpu unit tests to CI (#88107)
Adds `torch::deploy`'s GPU tests to core CI to make sure core changes don't break them.
Overall, deploy tests take 11 min, so it shouldn't be much of a burden :) https://github.com/pytorch/pytorch/actions/runs/3364231795/jobs/5578861939
Differential Revision: [D40861442](https://our.internmc.facebook.com/intern/diff/D40861442)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88107
Approved by: https://github.com/d4l3k, https://github.com/anirbanr-fb-r2p
