sched_ext: Assert per-task ops run on the task's owner

A per-task op must be dispatched on the scheduler that owns the task.
SCX_CALL_OP_TASK() and its _RET twin take @sch explicitly, and a caller that
passes the wrong scheduler would silently run the op on it. Add a
WARN_ON_ONCE() that @sch matches the task's owner so such a mismatch is
caught rather than hidden.

Two sites legitimately target a scheduler other than the task's owner:
cgroup_move() runs on the root sched, and scx_sub_init_cancel_task() fires
exit_task() on a task not yet associated with @sch. Both switch to the inner
__SCX_CALL_OP_TASK(), which dispatches on the explicit @sch without the
assert.

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

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