We add the `nodeLabels` key to the machine config to allow users to add node labels to the kubernetes Node object. A controller reads the nodeLabels from the machine config and applies them via the kubernetes API. Older versions of talosctl will throw an unknown keys error if `edit mc` is called on a node with this change. Fixes #6301 Signed-off-by: Philipp Sauter <philipp.sauter@siderolabs.com> Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>