bug: change err log to info in findOwningGateway (#1364)

Change err log to info in findOwningGateway

* Its not an error case when the managed envoy service or deployment
get reconciled after a gateway is deleted, since deleting the managed
service and deployment asscoiated with the gateway might not be
instanteous.

Fixes: #1347

Signed-off-by: Arko Dasgupta <arko@tetrate.io>

internal/provider/kubernetes/predicates.go

@@ -282,7 +282,7 @@ func (r gatewayAPIReconciler) findOwningGateway(ctx context.Context, labels map[
 	gatewayKey := types.NamespacedName{Namespace: gwNamespace, Name: gwName}
 	gtw := new(gwapiv1b1.Gateway)
 	if err := r.client.Get(ctx, gatewayKey, gtw); err != nil {
-		r.log.Error(err, "gateway not found")
+		r.log.Info("gateway not found", "namespace", gtw.Namespace, "name", gtw.Name)
 		return nil
 	}