[PyTorch][Distributed] Integrate with ShardedOptimizer in the unit test of ShardedLinear (#69569)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69569
Since ShardedOptimizer is added in https://github.com/pytorch/pytorch/pull/68607. We now integrate it in our unit test for Sharded Linear.
ghstack-source-id: 145773749
Test Plan: CI + Unit test
Reviewed By: wanchaol
Differential Revision: D32777020
fbshipit-source-id: eb6b1bb0f6234976f024273833154cab274fed25
