Add docs, example ConfigMap, describer, and review fixes

- Add Default Resource Modifiers section to restore-resource-modifiers.md
- Add --default-resource-modifier-configmap to customize-installation.md
- Add examples/default-resource-modifier-cni.yaml with CNI annotation
  stripping rules for OVN-K and Multus
- Update restore describer to show SkipDefaultResourceModifier when set
- Log warning when ResourceModifier Kind is not ConfigMap instead of
  silently doing nothing
- Add deployment_test.go coverage for the new server flag

Signed-off-by: Shubham Pampattiwar <spampatt@redhat.com>

pkg/cmd/util/output/restore_describer.go

@@ -219,6 +219,10 @@ func DescribeRestore(
 			DescribeResourceModifier(d, restore.Spec.ResourceModifier)
 		}
 
+		if boolptr.IsSetToTrue(restore.Spec.SkipDefaultResourceModifier) {
+			d.Printf("Skip Default Resource Modifier:\ttrue\n")
+		}
+
 		if restore.Spec.ResourcePolicy != nil {
 			d.Println()
 			DescribeResourcePolicies(d, restore.Spec.ResourcePolicy)