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_

Start by reproducing the issue with GitHub Copilot CLI and a Python .ipynb file containing multiple code cells. Trace how the CLI loads and executes notebook cells, then verify that cells run sequentially rather than being merged into one Python file.

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