[MPS] Casting int64 to int32 for reduction ops and raise warning. (#94484)
Currently casting it as a workaround till we have full support in OS.
Fixes #https://github.com/pytorch/pytorch/pull/88319#issuecomment-1424010624
Pull Request resolved: https://github.com/pytorch/pytorch/pull/94484
Approved by: https://github.com/razarmehr
