[Usability] Tolerate `torch.jit.script` call to Enum classes (#51624)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/51624
Reviewed By: SplitInfinity
Differential Revision: D26244694
Pulled By: gmagogsfm
fbshipit-source-id: c87a068cd11d6f497fa48dc206215300c55d6539
