[dynamo] Remove _dynamo.skip and fold it in _dynamo.disable (#98899)
Summary
There is confusion between`_dynamo.skip` and `_dynamo.disable`. This removes the `_dynamo.skip` API. The functionality is still available via `_dynamo.disable(recursive=False)`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98899
Approved by: https://github.com/jansel
