fix(kustomize): call json6902 only when needed

Call json6902 transformer only when there are patches to apply.

Addresses #5956

api/internal/builtins/PatchTransformer.go

@@ -89,7 +89,10 @@ func (p *PatchTransformerPlugin) Transform(m resmap.ResMap) error {
 	if p.smPatches != nil {
 		return p.transformStrategicMerge(m)
 	}
-	return p.transformJson6902(m)
+	if p.jsonPatches != nil {
+		return p.transformJson6902(m)
+	}
+	return nil
 }
 
 // transformStrategicMerge applies each loaded strategic merge patch