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.

未指定文件或测试。首先在 Unity Editor 中复现报告的两个工作流：生成一个缺少于 Network Prefab List 的 prefab，然后创建一个带有 NetworkObject 的 prefab 并重新打开它。跟踪 prefab 列表的处理，并将完成定义为：第一种情况显示明确的编辑器警告，第二种情况可靠地添加到 Default Network Prefab List。