Appease pyre (#3979)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/3979

Remove pyre annotations that are no longer needed

Add some ignores so I can add # pyre-strict, I don't actually know what the types of these things are

Reviewed By: mergennachin

Differential Revision: D58560545

fbshipit-source-id: d4b2749ea8d1b28795b910beab96403ce8554db3