feat: cks: allow setting ingressClassName

[joshsizer]

Proposed Changes

The annotation kubernetes.io/ingress.class is deprecated in favor of ingressClassName on Ingress resources: https://kubernetes.io/docs/concepts/services-networking/ingress/#deprecated-annotation

I haven't done any of the checklist items yet. If ya'll are open to this change let me know what else I should do to contribute this change.

Checklist

• I have bumped the necessary versions
• I have (re-)packaged the updated charts helm package $CHART_NAME -u
• I have updated the repo index helm repo index .
• I have added or updated documentation / readme (if appropriate)
• I have verified that my changes have not introduced new lint errors

Testing Instructions

Compare the output of the two helm template commands:

cd cks
helm template .
helm template . --set ingress.ingressClassName=nginx