fix(kubectl): all-namespaces flag being ignored by ToBuilder() in builder_flags.go

Author: ashutoshgngwr

staging/src/k8s.io/cli-runtime/pkg/genericclioptions/builder_flags.go

@@ -130,6 +130,10 @@ func (o *ResourceBuilderFlags) ToBuilder(restClientGetter RESTClientGetter, reso
 	builder := resource.NewBuilder(restClientGetter).
 		NamespaceParam(namespace).DefaultNamespace()
 
+	if o.AllNamespaces != nil {
+		builder.AllNamespaces(*o.AllNamespaces)
+	}
+
 	if o.Scheme != nil {
 		builder.WithScheme(o.Scheme, o.Scheme.PrioritizedVersionsAllGroups()...)
 	} else {