add test_c10d_spawn_ucc.py (#86508)
Initial PR to create UCC equivalent of https://github.com/pytorch/pytorch/blob/master/test/distributed/test_c10d_spawn_gloo.py and
https://github.com/pytorch/pytorch/blob/master/test/distributed/test_c10d_spawn_nccl.py. Currently only added common ops.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86508
Approved by: https://github.com/kwen2501
