fix: migrate to kube_codegen

[inspirit941]

Changes

migrate from deprecated generate-group.sh to kube_codegen

/kind

Fixes #636

referenced from knative-extensions/eventing-github#550

[knative-prow]

@inspirit941: The label(s) kind/<kind> cannot be applied, because the repository doesn't have them.

In response to this:

Changes

migrate from deprecated generate-group.sh to kube_codegen

/kind

Fixes #636

referenced by knative-extensions/eventing-github#550

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[linux-foundation-easycla]

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[knative-prow]

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[knative-prow]

Welcome @inspirit941! It looks like this is your first PR to knative-extensions/sample-source 🎉

[knative-prow]

Hi @inspirit941. Thanks for your PR.

I'm waiting for a knative-extensions member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.