Migrate to new K8s generator scripts/go commands

[ReToCode]

Context

See https://cloud-native.slack.com/archives/C04LGHDR9K7/p1704710449414709 and #2904

Possible solutions

Based on #2904 (comment) and discussions.

a) Use go run instead of scripts (downside: this does not clean up old resources)
b) Use the new k8s.io/code-generator/kube_codegen.sh
c) Wait until @cardil manages to migrate the scripts in K8s to full golang, then adapt to that solution

Todo

• Agree on which way to go
• Implement in pkg
• Implement on all downstream repos

[ReToCode]

From the discussion in kubernetes/kubernetes#122236 it is best to wait a bit until Kubernetes figures out the new way. Until then, knative/hack#357 will help to minimize the work needed for now.

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