selftests/sched_ext: Fail loudly when EXIT_KIND is missing from BTF

EXIT_KIND() resolved scx_exit_kind values through
__COMPAT_ENUM_OR_ZERO(), which maps a missing enumerator to 0 (==
SCX_EXIT_NONE). struct scx_exit_info carries the enum itself, so the
BTF of any loaded scheduler always has the type, and every enumerator
the tests resolve today exists on all sched_ext kernels: the fallback
got the value right, and the single comparison that could pass
vacuously was the kick.c error poll.

Still, a silently-zeroed lookup is a trap. EXIT_KIND() is now an
alias of SCX_KIND_VAL(), which fails the test loudly when the
enumerator is missing. Convert the remaining
`kind != EXIT_KIND(SCX_EXIT_NONE)` checks (allowed_cpus,
cgroup_nr_cpus, cyclic_kick_wait and enq_blocked) to UEI_EXITED() so
they keep their semantics without a BTF lookup, and hoist kick.c
invalid_one()'s error_kind resolution above the gated-worker spawn so
a failing lookup cannot bypass its cleanup path.

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

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