Add policy label to BackendLBPolicy to make it recognizable in gwctl (#3195)

* Add policy label to BackendLBPolicy to make it recognizable in gwctl

* Run ./hack/update-codegen.sh

Author: gauravkghildiyal

apis/v1alpha2/backendlbpolicy_types.go

@@ -26,6 +26,9 @@ import (
 // +kubebuilder:storageversion
 // +kubebuilder:resource:categories=gateway-api,shortName=blbpolicy
 // +kubebuilder:printcolumn:name="Age",type=date,JSONPath=`.metadata.creationTimestamp`
+//
+// BackendLBPolicy is a Direct Attached Policy.
+// +kubebuilder:metadata:labels="gateway.networking.k8s.io/policy=Direct"
 
 // BackendLBPolicy provides a way to define load balancing rules
 // for a backend.