We should not be using corev1.ObjectReference #1149
Description
What happened:
InferencePool.Status.Parents.ParentRef is currently using corev1.ObjectReference:
What you expected to happen:
The definition of corev1.ObjectReference strongly discourages the use of this type. We should follow that guidance and switch to a custom ObjectReference type here. To help ensure that this is largely backwards-compatible and consistent with Gateway API, we should copy the ParentGatewayReference from Gateway API.