[LLDB] Skip TestExitDuringExpression on arm/linux buildbot

TestExitDuringExpression test_exit_before_one_thread_unwind fails
sporadically on arm/linux. This seems like a thread timing issue.
I am marking it skip for now.

GitOrigin-RevId: 0df28acffb5637ffb9abc908ef638f29389e0012
1 file changed