sched/fair: Use the new cfs_rq.h_nr_runnable

Use the new h_nr_runnable that tracks only queued and runnable tasks in the
statistics that are used to balance the system:

 - PELT runnable_avg
 - deciding if a group is overloaded or has spare capacity
 - numa stats
 - reduced capacity management
 - load balance
 - nohz kick

It should be noticed that the rq->nr_running still counts the delayed
dequeued tasks as delayed dequeue is a fair feature that is meaningless
at core level.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Link: https://lore.kernel.org/r/20241202174606.4074512-6-vincent.guittot@linaro.org