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.
2342d0cd57