Disables method variant grad and grad grad checks (#49576)
Summary:
These are redundant with the functional variant checks and can be very costly, as some grad and gradgrad testing takes minutes to run per variant. Maybe in the future we'll add them back for operations with divergent method implementations.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49576
Reviewed By: albanD, ngimel
Differential Revision: D25631691
Pulled By: mruberry
fbshipit-source-id: 247f750979d9dafab2454cdbfa992a2aa6da724a
