Add launch flag to bypass trust folder prompt

When automating `copilot` CLI from scripts it would be very helpful to have a way to opt-in to trusting the folder via a launch flag so that the folder doesn't first have to be trusted via an interactive session and answering the prompt manually, or by directly editing the `~\.copilot\config.json` file.

I'm imagining something like:

```
$ copilot --trust-folder --allow-all-tools
```

Related #1121

從 copilot CLI 的啟動引數處理開始，並閱讀相關 issue #1121 以了解現有的上下文。新增一個啟動旗標，讓目前的資料夾無需互動式提示即可受信任，包括與 --allow-all-tools 結合使用時。完成標準是：透過指令碼啟動時，無需編輯 config.json 或手動回應提示即可信任該資料夾。

由索引模型根據 Issue 內容生成。