[BE] Enable functional optim tests for windows (#63462)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63462
Now that `torch.distributed.optim` gates DistributedOptimizer on RPC availability, these tests can be run on windows.
ghstack-source-id: 136437635
Test Plan: CI
Reviewed By: SciPioneer
Differential Revision: D30358923
fbshipit-source-id: 36739bdfe7214789f17de652d30c62c2bc124c73
