Service detail page: Show loadbalancer ip or hostname from the service status

[bashofmann]

Summary

Service detail page: Show loadbalancer ip or hostname from the service status, if the spec field is empty

Fixes #6245

Occurred changes and/or fixed issues

Currently the external IP is only shown, if it was defined in the Service spec. In most cases the external IP or hostname of a LoadBalancer Service is automatically assigned by the cloud provider though. In that case spec.loadBalancerIP is empty. But you can see the assigned information in status.loadBalancer.ingress.

This PR shows the information from the status if the spec field is empty.

Technical notes summary

A lot of cloud providers assign a IP address to a load balancer service (e.g. AKS), but some assign a hostname (e.g. EKS).

Areas or cases that should be tested

Service detail page for services of type LoadBalancer, e.g. in an AKS, EKS or GKE cluster.

Areas which could experience regressions

Service detail page.

Screenshot/Video

Example on AKS

Example on EKS

[catherineluse]

LGTM

To test this PR,

1. I provisioned an RKE2 cluster with the Amazon cloud provider enabled
2. In cluster explorer, created a Service of type LoadBalancer without loadBalancerIP in the spec.
3. On the Service detail page, confirmed that the Load Balancer value in the header was taken from the Service's status.loadBalancer.ingress.hostname
4. Edited the Service YAML and set spec.loadBalancerIPto SomeText
5. Went to the Service detail page and confirmed that the LoadBalancer value was SomeText