[Helm chart] support adding separate labels for the ingress-nginx-controller-internal service

[mo-saeed]

Right now the internal service in helm chart inherit the labels from the parent and from the main controller service, in some cases I would like to add labels only to the internal service.

in my use case I need to use external-dns to create a record based on the label.

https://github.com/kubernetes/ingress-nginx/blob/main/charts/ingress-nginx/templates/controller-service-internal.yaml#L9

[k8s-ci-robot]

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[strongjz]

At this time we not actively adding new features as we migrate our focus to ingate.

We have discussed at the gateway-api community meeting and our latest ingress-nginx Kubcon Maintainer talk.

The repo to following along is at: https://github.com/kubernetes-sigs/ingate

[strongjz]

@mo-saeed Are you going to work on a PR for this?

If not, I am afraid I will have to close this request.

/triage needs-information