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>