Remove starlark dependencies from api module

[KnVerey]

As requested in kubernetes/kubernetes#98946, we need to make it possible to use Kustomize as a library without pulling in a starlark dependency. Starlark functionality should remain available in the standalone kustomize binary, but this should be done via injection so that it does not affect kubectl. We can revisit this decision if starlark functions graduate out of alpha, but for now, we don't expose them in kubectl at all.

[mikebz]

I think this is a great idea. In general I would probably look for limiting the number of "extension points" in kustomize because it can lead to security issues.

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/lifecycle stale

[k8s-triage-robot]

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• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle rotten

[KnVerey]

We are instead going to remove Starlark support entirely: #4349