tools/sched_ext: scx_qmap - Consume cgroup weights through set_weight

With the set_* ops delivered to the parent's sched, a parent qmap instance
now receives cgroup_set_weight for its child subs' attach points. Update
the matching sub_sched_ctx weight and redistribute() in-kernel, and drop
the userspace feed_weights() polling. This exercises the knob routing end
to end.

The self weight is fixed at 100: a cgroup's weight is its parent's knob and
not the scheduler's own business. This drops the self-weight polling and the
repartition PROG_RUN poke with it.

sub_attach seeds the slot with the cgroup's current weight, read through
bpf_cgroup_from_id(), so a weight set before the sub attaches is picked up.
A write racing the attach can still be lost until the next value-changing
cpu.weight write. Acceptable for a demo.

While at it, add a traced ops.cgroup_move() so tests can observe move
delivery.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>

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