🐛 Fix use of UnstructuredList with unregistered typed

[ironcladlou]

Before this change, passing an unstructured.UnstructuredList to
client.List() would erroneously delegate to the typed client, causing an error
if the target type isn't registered with the client's scheme, violating the
purpose of using unstructured.

This patch fixes the client so that the unstructured.UnstructuredList is
delegated to the internal unstructured client.

[k8s-ci-robot]

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[alvaroaleman]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, ironcladlou

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[ironcladlou]

Here's an example of what the failure looks like:

list := &unstructured.UnstructuredList{}
list.SetGroupVersionKind(schema.GroupVersionKind{
  Group:   "group.example.com",
  Version: "v1",
  Kind:    "FooList",
})
client.List(context.TODO(), list)

v1.ListOptions is not suitable for converting to "group.example.com/v1" in scheme "example.go:xx"

[alvaroaleman]

/retest

[alvaroaleman]

The heck.
/retest