Prefab Quality of Life Changes

Feedback
There doesn't appear to be any logging in the Editor if you call GetComponent<NetworkObject>().Spawn() after instantiating a Prefab that does not appear in the Network Prefab List. The object will silently fail to appear for clients.

Also, when you create a new prefab with a NetworkObject it does not seem to be automatically added to the Default Network Prefab List. If you re-open your prefab and toggle an object or component on and off, it seems like that is what will get it added to the Default list.

未指定檔案或測試。先在 Unity Editor 中重現回報的兩個工作流程：生成一個缺少於 Network Prefab List 的 prefab，然後建立一個帶有 NetworkObject 的 prefab 並重新開啟它。追蹤 prefab 清單的處理，並將完成定義為：第一種情況顯示明確的編輯器警告，第二種情況可靠地新增至 Default Network Prefab List。