Migrate to new K8s generator scripts/go commands

[ReToCode]

Context

See https://cloud-native.slack.com/archives/C04LGHDR9K7/p1704710449414709 and https://github.com/knative/pkg/pull/2904

Possible solutions

Based on https://github.com/knative/pkg/pull/2904#issuecomment-1851613905 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 https://github.com/kubernetes/kubernetes/pull/122236 it is best to wait a bit until Kubernetes figures out the new way. Until then, https://github.com/knative/hack/pull/357 will help to minimize the work needed for now.

[github-actions[bot]]

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