Fix vscode-jupyter hanging by executing vscode commands locally

[001ben]

Description

Implement fix for issue described in #963

Simplest fix is to not ad %%spark to any code containing _VSCODE_ as this code should only be intended for running locally.

See example VScode bootstrapping code here: #963

Checklist

• Wrote a description of my changes above
• Formatted my code with black
• Added a bullet point for my changes to the top of the CHANGELOG.md file
• Added or modified unit tests to reflect my changes
• Manually tested with a notebook
• If adding a feature, there is an example notebook and/or documentation in the README.md file

[devstein]

Thank you for the PR @001ben! I don't have local set up to reproduce, but think this looks good.

I reached out to a few folks that have run into this issue to see if this fix works for them as well.