fixed cilium-operator delete CEC cilium-ingress.

When the ingress controller is in shared mode, we create an ingress resources with an ingressclass does not belong to cilium, the ciliumEnvoyConfig resource in kube-system called cilium-ingress is deleted making all ingress routing by cilium fail.

Signed-off-by: chaunceyjiang <chaunceyjiang@gmail.com>

Fixes cilium#28638

operator/pkg/ingress/ingress.go

@@ -655,6 +655,10 @@ func (ic *Controller) isEffectiveLoadbalancerModeDedicated(ing *slim_networkingv
 }
 
 func (ic *Controller) garbageCollectOwnedResources(ing *slim_networkingv1.Ingress) error {
+	// When the Ingress is in shared mode, shared resources cannot be deleted.
+	if !ic.isEffectiveLoadbalancerModeDedicated(ing) {
+		return nil
+	}
 	cec, svc, ep, err := ic.regenerate(ing, false)
 	if err != nil {
 		return err