Test disabling justMyCode in notebook debugging

[roblourens]

Refs: #8146

• macOS @mjbvz
• linux @jrieken
• windows @luabud

Complexity: 3

Create Issue

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• Set "jupyter.debugJustMyCode": false
• Open a Jupyter notebook
• Add a breakpoint to a cell, and debug with the "Debug Cell" command

- Verify that "step in" will step into library code. For example, you can step into `print(1)` or another library. Example:

import ipywidgets as widgets
a = widgets.IntSlider(description='a')
a