selftests/sched_ext: Bound exit waits

exit, prog_run and hotplug wait for the scheduler under test to exit
with no time bound; a scheduler that never exits hangs the runner
instead of failing the test. Bound the waits to ~10s (iteration-based)
with the new SCX_TIMED_WAIT_UEI() helper, which stretches on a loaded
system instead of failing early.

exit.c returns straight from its timeout path, which would leave the
link and the skeleton alive and the unexited scheduler attached for
the rest of the runner run - every later test would then fail to
attach with EBUSY and bury the real failure. Destroy both before
failing, like prog_run and hotplug already destroy the link.

Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>

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