[composite compliance] prod (#81969)
Ref: #69991
Also fixes #82644 (fix similar to #81617)
For CompositeCompliance, we can't use `item` to choose a special fast-path when Tensor is a Subclass. Instead we always dispatch to the slower but safer implementation.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/81969
Approved by: https://github.com/zou3519
