fix: omit PlacementDecision score field when zero-valued

Add omitzero json tag to ClusterDecision.Score so that the default zero value is not serialized to JSON. The field remains int64 (non-pointer) and is only included when explicitly set to a non-zero value.

Signed-off-by: Mike Ng <ming@redhat.com>

Author: mikeshng

cluster/v1beta1/types_placementdecision.go

@@ -61,7 +61,7 @@ type ClusterDecision struct {
 
 	// Score is the computed score for the cluster based on configured prioritizers
 	// +optional
-	Score int64 `json:"score"`
+	Score int64 `json:"score,omitzero"`
 }
 
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object