Previously, the HPA controller ignored APIVersion when resolving the
scale subresource for a kind, meaning if it was set incorrectly in the
HPA's scaleTargetRef, it would not matter.  This was the case for
several of the HPA e2e tests.

Since the polymorphic scale client merged, APIVersion now matters.  This
updates the HPA e2es to care about APIVersion, by passing kind as a full
GroupVersionKind, and not just a string.