[LLDB] Skip TestExitDuringExpression on aarch64/linux buildbot

TestExitDuringExpression test_exit_before_one_thread_unwind fails
sporadically on both Arm and AArch64 linux buildbots.
This seems like a thread timing issue. I am marking it skip for now.

GitOrigin-RevId: 7dd76cccca02ee59588647f2d97f1b554c48f580
1 file changed