[MPS] Fix `copy_kernel_mps` (#78428)
By passing `storage_offset` of source and destination Tensors
This fixes following simple usecase:
```
python3` -c "import torch;x=torch.zeros(3, 3, device='mps'); x[1, 1]=1;print(x)"
```
Add test to validate it would not regress in the future
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78428
Approved by: https://github.com/kulinseth
(cherry picked from commit 437ecfc4612b73ada1f99de94f3c79de6b08f99a)
