Instead of converting the unstructured item to check for the presence of
the `kube-aggregator.kubernetes.io/automanaged` label, use this label in
the `AppliesTo` to enable the restore logic to select the item. This
means that any item that matches the selector will have restore skipped.
Also add a new test case to the restore action test to check that label
selectors are applied correctly.
Signed-off-by: Bridget McErlean <bmcerlean@vmware.com>