[dynamo] disable flaky test_unhandled_exception_in_dynamo2 (#108906)
Fix https://github.com/pytorch/pytorch/issues/106028.
The test `test_unhandled_exception_in_dynamo` should cover most cases. The disabled test `test_unhandled_exception_in_dynamo2` covered some weird case that I found when implementing dynamo 3.11.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108906
Approved by: https://github.com/yanboliang
