[dtensor] fix requires_grad in distribute_tensor (#107606)
This PR fixes the requires_grad set when calling distribute_tensor, we
should set the requires_grad of the local tensor after the detach call
to make sure we create the leaf correctly, otherwise it would raise
warnings
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107606
Approved by: https://github.com/fduwjj
