Remove starlark support

[dims]

Helps drop starlark from kubernetes dependencies, also found an issue here #4349 as well

❯ go mod graph | grep go.starlark.net | sort
[email protected] github.com/chzyer/[email protected]
[email protected] github.com/chzyer/[email protected]
[email protected] github.com/chzyer/[email protected]
[email protected] github.com/google/[email protected]
[email protected] golang.org/x/[email protected]
[email protected] golang.org/x/[email protected]
[email protected] golang.org/x/[email protected]
[email protected] google.golang.org/[email protected]
k8s.io/cli-runtime [email protected]
k8s.io/[email protected] [email protected]
k8s.io/kubectl [email protected]
k8s.io/[email protected] [email protected]
k8s.io/kubernetes [email protected]
k8s.io/sample-cli-plugin [email protected]
sigs.k8s.io/kustomize/[email protected] [email protected]
sigs.k8s.io/kustomize/kustomize/[email protected] [email protected]
sigs.k8s.io/kustomize/[email protected] [email protected]

[dims]

/assign @koba1t

[stormqueen1990]

/lgtm

[koba1t]

@dims
Thanks for sending the cleanup PR for the deprecated feature!

However, I think it would be better to remove the three currently deprecated alpha plugins at the same time.
Unless you have a reason to rush the removal of this feature, it may take some time to make progress.
https://kubectl.docs.kubernetes.io/guides/extending_kustomize/#plugin-feature-status

[koba1t]

The results of my investigation

According to the Kustomize plugin proposal, we can only remove the legacy 'exec' and 'Go' plugins after we move to the beta phase.
Therefore, we can't delete the above two legacy plugins now.
https://github.com/kubernetes/enhancements/blob/61b21e5105e5fda4d6c53821ff82dd39a1a98f07/keps/sig-cli/2953-kustomize-plugin-graduation/README.md#L587

The proposal says that the 'starlark plugin' will be removed after the transition to beta. However, considering the lack of response to the following issue, we think it is safe to remove it now to cleanup dependencies。
#4349

/lgtm
/approve

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