Always include autograd context id in rpc/remote requests (#29781)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29781
Even though the request might not contain any requires_grad tensor,
the return value could. Therefore, we should always include the
autograd context id in the request.
closes #28819
Test Plan: Imported from OSS
Differential Revision: D18496709
Pulled By: mrshenli
fbshipit-source-id: 2f870c410291a1300952895b7488ea07e5574228
