Add cumprod support for device mps (#104688)
Related to #77764
Add support for the cumprod operation (which in turn allows its gradient). This also allows us to compute the gradient of prod since it was blocked behind cumprod in the case where exactly one element of the tensor was 0.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/104688
Approved by: https://github.com/kulinseth
