🐛 govmomi: fix additional printer columns for ControlPlaneEndpoint

[chrischdi]

What this PR does / why we need it:

The old printercolumn did never work because it never was a list, it was always an object.

Fixes #3362

New output uses .spec.controlPlaneEndpoint.host as other providers also do (e.g. CAPZ, CAPO).

CAPA diverges: it has some instances using .spec.controlPlaneEndpoint.host (ManagedAWSCluster, RosaAWSCluster), others .spec.controlPlaneEndpoint.

This PR renders out as e.g.:

❯ kubectl get vspherecluster -o wide
NAME   READY   SERVER   CONTROLPLANEENDPOINT   AGE
foo                     1.2.3.4                18m

An alternative would be to use .spec.controlPlaneEndpoint which would result in json output:

❯ kubectl get vspherecluster -o wide
NAME   READY   SERVER   CONTROLPLANEENDPOINT             AGE
foo                     {"host":"1.2.3.4","port":8443}   19m

Combining host and port would require CEL in additional print columns which needs kubernetes/enhancements#4595 first and in a k8s version which is the lowest supported kubernetes version for the management cluster.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[sbueringer]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: addfa75b1174639eaf3c921f312ef76c799a53ff

[k8s-ci-robot]

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This pull-request has been approved by: sbueringer

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[chrischdi]

/retest