k8s: rely on namespace informer label selector

\nSigned-off-by: avlitman <alitman@redhat.com>\nSigned-off-by: Shirly Radco <sradco@redhat.com>\nSigned-off-by: machadovilaca <machadovilaca@gmail.com>\nCo-authored-by: Cursor AI Agent <cursor-ai@users.noreply.github.com>\n

Author: sradco

pkg/k8s/namespace.go

@@ -90,11 +90,7 @@ func (nm *namespaceManager) updateMonitoringNamespace(ns *corev1.Namespace) {
 	nm.mu.Lock()
 	defer nm.mu.Unlock()
 
-	if ns.Labels != nil && ns.Labels[ClusterMonitoringLabel] == "true" {
-		nm.monitoringNamespaces[ns.Name] = true
-	} else {
-		delete(nm.monitoringNamespaces, ns.Name)
-	}
+	nm.monitoringNamespaces[ns.Name] = true
 }
 
 func (nm *namespaceManager) removeMonitoringNamespace(name string) {