Introduce ginkgo labels

[sbueringer]

Similar to Cluster API we should start using Ginkgo labels (kubernetes-sigs/cluster-api#9620).

This should make it easier to label our tests correctly.

E.g. with the manual "tagging" + corresponding job config we have today we are always forced to implement govmomi tests when we want to add something for e.g supervisor.

(extracted from kubernetes-sigs/cluster-api#9620)

[sbueringer]

/help

[k8s-ci-robot]

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