Error executing python notebook with multiple code cells

### Describe the bug

Error executing python notebook with multiple code cells. it expects all code cells merged into one python file.

### Affected version

_No response_

### Steps to reproduce the behavior

Ask GitHub copilot cli to execute a .ipynb file that has multiple code cells.

### Expected behavior

It should be able execute one code cell at a time sequentially.

### Additional context

_No response_

首先使用 GitHub Copilot CLI 和一個包含多個程式碼儲存格的 Python .ipynb 檔案重現該問題。追蹤 CLI 如何載入及執行 notebook 儲存格，然後確認這些儲存格是依序執行，而不是被合併成一個 Python 檔案。

由索引模型根據 Issue 內容生成。