Delete load balancers before subnets

When using an internal load balancer, the internal IP addresses
uses a cluster subnet. To avoid "already being used" errors on
the subnet deletion, delete the load balancer first.

controllers/gcpcluster_controller.go

@@ -231,8 +231,8 @@ func (r *GCPClusterReconciler) reconcileDelete(ctx context.Context, clusterScope
 	log.Info("Reconciling Delete GCPCluster")
 
 	reconcilers := []cloud.Reconciler{
-		subnets.New(clusterScope),
 		loadbalancers.New(clusterScope),
+		subnets.New(clusterScope),
 		firewalls.New(clusterScope),
 		networks.New(clusterScope),
 	}