Test: All code symbols for a notebook in goto symbols quickpick

[amunger]

Refs: microsoft/vscode-jupyter#13930

• macOS @isidorn
• linux @andreamah
• windows @mjbvz

Complexity: 3

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Pre-requisites - If you don't have python set up to run notebooks

1. ensure python is installed on your machine
2. open a workspace where you will be running tests for this TPI
3. Create: new jupyter notebook and run print(1) in a cell.
   a. If the cell runs successfully, you're already set up, otherwise...
4. The kernel picker should open, select "Python Environments..." -> "Create Python Environment..." -> select venv or conda, and whichever version you'd like.

A virtual environment should get created in your workspace with all necessary packages installed, and the cell should run successfully.

Testing

1. set "notebook.gotoSymbols.showAllSymbols": true
2. open a notebook with several symbols across multiple cells, and some markdown cells intermixed
   e.g. symbols.ipynb.txt (remove the .txt extension)
3. Make sure you have a kernel selected so there is a language server available (you can just run a cell to check this)
4. open the goto symbols quickpick ctrl+shift+o and use it to navigate to symbols in the notebook