Data ownership transfer tests fail in Ray 2.4.0

[kira-lin]

Now ray.data seems to not work when in ray client mode. Functions like ds.show, ds.mean will fail when using ray client, since driver is not connected to raylet (core_worker is None).

I have submitted an issue about this ray-project/ray#34770. But nobody helps so far. We can skip this test in ray client mode for now.