Update test_overrides for gradcheck (#57155)
Summary:
Run both fast and slow mode for test overrides and fix failure in slow_mode
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57155
Reviewed By: albanD
Differential Revision: D28076483
Pulled By: soulitzer
fbshipit-source-id: ef942d787d986ba881329e9515e5de6194f3782b
