It was discovered during Velero 1.6.3 upgrade testing that Velero was
restoring `APIService` objects for APIs that are no longer being served
by Kubernetes 1.22. If these items were restored, it would break the
behaviour of discovery within the cluster.

This change introduces a new RestoreItemAction plugin that skips the
restore of any `APIService` object which is managed by Kubernetes such
as those for built-in APIs or CRDs. The `APIService`s for these will be
created when the Kubernetes API server starts or when new CRDs are
registered. These objects are identified by looking for the
`kube-aggregator.kubernetes.io/automanaged` label.
Signed-off-by: Bridget McErlean <bmcerlean@vmware.com>