Proposal: Update Deprecated generate-groups.sh to kube_codegen.sh

[inspirit941]

I've noticed that the generate-groups.sh script currently used in hack/update-codegen.sh is deprecated and no longer functioning. (https://github.com/kubernetes/code-generator/blob/master/generate-groups.sh)

I'd like to propose updating it to kube_codegen.sh to address this issue.

Proposal

• Replace generate-groups.sh with kube_codegen.sh.

I've personally tested this change by modifying the update-codegen script to use kube_codegen.sh, and it works as expected.

• inspirit941@97232ba

Questions

• Would it be appropriate to submit a Pull Request with these changes?
• Are there any additional considerations I should be aware of before proceeding?

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