[FG:InPlacePodVerticalScaling] Handle in-place pod resource updates in LimitRanger admission plugin

[tallclair]

The LimitRanger admission plugin does not currently handle pod updates, but needs to be updated to account for InPlacePodVerticalScaling:

kubernetes/plugin/pkg/admission/limitranger/admission.go

Lines 424 to 429 in 4f04dff

	// Since containers and initContainers cannot currently be added, removed, or updated, it is unnecessary
	// to mutate and validate limitrange on pod updates. Trying to mutate containers or initContainers on a pod
	// update request will always fail pod validation because those fields are immutable once the object is created.
	if a.GetKind().GroupKind() == api.Kind("Pod") && a.GetOperation() == admission.Update {
	return false
	}

/sig node

[tallclair]

/triage accepted

[olderTaoist]

/triage accepted

can let me try？

[mouuii]

/assign