fixed cilium-operator delete CEC cilium-ingress when other ingresscla…

…ss resources are created

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

Fixes #28638

operator/pkg/ingress/ingress.go

@@ -659,7 +659,8 @@ func (ic *Controller) garbageCollectOwnedResources(ing *slim_networkingv1.Ingres
 		return err
 	}
 
-	if cec != nil {
+	if cec != nil && ic.isEffectiveLoadbalancerModeDedicated(ing) {
+		// When the `ingress controller` is in shared mode, shared CEC cannot be deleted.
 		if err := deleteObjectIfExists(cec, ic.envoyConfigManager.getByKey, ic.clientset.CiliumV2().CiliumEnvoyConfigs(cec.GetNamespace()).Delete); err != nil {
 			return err
 		}