[BE] Add dtypesIfMPS to ModuleInfo enabling float16 tests for MPS and remove all skipIfMPS for float64 (#119039)
Right now, `ModuleInfo.dtypes` defaults to `torch.testing._internal.common_dtype.floating_types()`, almost no ModuleInfos override this (so only `float32` and `float64` are tested).
This is the first step to clean up/improve dtype testing for `ModuleInfos` and fix #116626.
Follow up PRs will updates `dtypes=` (and perhaps `dtypesIf{Device}` (if it makes sense)) for each `ModuleInfo`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119039
Approved by: https://github.com/janeyx99
