For IPv6-primary dual-stack cluster, kubelet.service renders only single node-ip

This is a clone of issue OCPBUGS-8676. The following is the description of the original issue:
—
When implementing support for IPv6-primary dual-stack clusters, we have extended the available IP families to

const (
	IPFamiliesIPv4                 IPFamiliesType = "IPv4"
	IPFamiliesIPv6                 IPFamiliesType = "IPv6"
	IPFamiliesDualStack            IPFamiliesType = "DualStack"
	IPFamiliesDualStackIPv6Primary IPFamiliesType = "DualStackIPv6Primary"
)

At the same time definitions of kubelet.service systemd unit still contain the code

{{- if eq .IPFamilies "DualStack"}}
        --node-ip=${KUBELET_NODE_IPS} \
{{- else}}
        --node-ip=${KUBELET_NODE_IP} \
{{- end}}

which only matches the "old" dual-stack family. Because of this, an IPv6-primary dual-stack renders node-ip param with only 1 IP address instead of 2 as required in dual-stack.