Promote NamespaceDefaultLabelName to GA

[rosenhouse]

/kind feature

What this PR does / why we need it:

Promote NamespaceDefaultLabelName to GA
Follow-up to #96968

Does this PR introduce a user-facing change?

Promote NamespaceDefaultLabelName to GA.  All Namespace API objects have a `kubernetes.io/metadata.name` label matching their metadata.name field to allow selecting any namespace by its name using a label selector.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

- [KEP]: https://github.com/kubernetes/enhancements/pull/2162

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[k8s-ci-robot]

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[rosenhouse]

/sig api-machinery

[jayunit100]

/ok-to-test

[thockin]

Thanks!

/lgtm
/approve

[dims]

@rosenhouse please see the logs of the failed tests (specifically the pull-kubernetes-unit one), may need to fix a unit test before this can go green. the rest may be flakes.

Also need a companion PR in kubernetes/enhancements that updates the version and timelines in:

• https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/2161-apiserver-default-labels/kep.yaml
• https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/2161-apiserver-default-labels/README.md

thanks!

[thockin]

Thanks!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rosenhouse, thockin

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• pkg/apis/core/OWNERS [thockin]
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[fedebongio]

/triage accepted

[rosenhouse]

Thanks y'all. Ack on the follow-up PR to the KEP, I'll find some time for that soon!