[DTensor] Replace usage of compute_local_offset by compute_local_shape_and_global_offset (#108547)
This PR removes four usages of compute_local_offset() in PyTorch repo and replaces it with the new API compute_local_shape_and_global_offset().
We will be removing compute_local_offset() API in the next diff, as there are usages internally.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108547
Approved by: https://github.com/wanchaol
