Calico: populate kubernetes-services-endpoint for localhost LB (#12598)

When loadbalancer_apiserver_localhost is enabled, Calico falls back to the
Kubernetes service IP because the kubernetes-services-endpoint ConfigMap is
empty. CNI then fails to reach the API server even though an nginx proxy is
listening on localhost.

Update kube_apiserver_global_endpoint to always reference the localhost load
balancer (respecting the configured port) and populate the ConfigMap for both
eBPF and localhost LB modes.

roles/network_plugin/calico/templates/kubernetes-services-endpoint.yml.j2

@@ -5,7 +5,7 @@ metadata:
   namespace: kube-system
   name: kubernetes-services-endpoint
 data:
-{% if calico_bpf_enabled %}
+{% if calico_bpf_enabled or loadbalancer_apiserver_localhost %}
   KUBERNETES_SERVICE_HOST: "{{ kube_apiserver_global_endpoint | urlsplit('hostname') }}"
   KUBERNETES_SERVICE_PORT: "{{ kube_apiserver_global_endpoint | urlsplit('port') }}"
 {% endif %}