Test transition from JediLSP to Jedi language server

[kimadeline]

Refs: #17225

• macOS @lydiayschung
• windows @joyceerhl
• linux @jrieken

Complexity: 2

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Requirements

1. You will need Python 3 (doesn't matter which minor/patch version). Options are:
   • You can install it from python.org
   • On Mac/Linux, you can install it using your local package manager
   • For a managed solution that will allow you to install multiple versions of Python you can use pyenv on Mac/Linux, or pyenv-win on Windows, and call pyenv install 3.9.4
2. Make sure you have "python.experiments.optInto": ["All"], in your user settings. If not, add it and reload VS Code.
3. Make sure the python.defaultInterpreterPath entries in your user and workspace settings are at their default value python
4. Use the latests Insiders build of the Python extension (set python.insidersChannel to daily, wait for the download and installation to happen and reload VS Code)

Verification steps

1. Create a folder with a Python file, and add the following .vscode/settings.json:

{
   "python.languageServer": "JediLSP"
}

2. Verify that there are squiggles under JediLSP
3. Open the folder and activate the extension
4. Verify that the value of the python.languageServer setting was updated to Jedi
5. Verify that Starting Jedi language server. was printed in the Python output panel