Calico: Add kube_service_addresses_ipv6 to serviceClusterIPs

[olemathias]

Add IPv6 Service Addresses to BGP advertisement when calico_advertise_cluster_ips is true.

What type of PR is this?
/kind feature

What this PR does / why we need it:
Currently when enabling calico_advertise_cluster_ips only IPv4 kube_service_addresses is added. This PR also adds IPv6 kube_service_addresses_ipv6 when enable_dual_stack_networks is true.

Which issue(s) this PR fixes:
Fixes #7889

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Calico: kube_service_addresses_ipv6 is now added to serviceClusterIPs if enable_dual_stack_networks is true.

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[oomichi]

According to https://docs.projectcalico.org/networking/advertise-service-ips#advertise-service-cluster-ip-addresses this option seems good.
In addition, this kube_service_addresses_ipv6 is available only if enable_dual_stack_networks is true on Kubespray side.
That also looks good for me because of the following description:

# Kubernetes internal network for IPv6 services, unused block of space.
# This is only used if enable_dual_stack_networks is set to true
# This provides 4096 IPv6 IPs
kube_service_addresses_ipv6: fd85:ee78:d8a6:8607::1000/116

/lgtm

[oomichi]

forgot to put ok-to-test..

/ok-to-test

[floryut]

👍

[floryut]

@olemathias Thanks for the PR

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, olemathias

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