enforce valid kubernetes labels
enforce valid kubernetes labels

PiperOrigin-RevId: 379745825
Change-Id: Ic9758cdb0b1f4ef2d626df853e7f075bc0c3da6a
GitOrigin-RevId: 518ad1ae5c9d8982f2ea08ff3215edb3c8283f65

deepmind/xmanager,deepmind/xmanager