don't allow alias dispatch keys to go in the DispatchKeySet (#61771)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/61771
Test Plan: Imported from OSS
Reviewed By: asuhan
Differential Revision: D29736432
Pulled By: bdhirsh
fbshipit-source-id: 54bb716db1e41565b00f4f01ea0096f834087577
