[Feature] (XS DevOps) Add jupyterlab build folders to .gitignore.

[jfarid27]

Description

Adds jupyterlab build folders to .gitignore. Currently the build process when setting up creates build folders when following jupyterlab instructions.

Resolves #2121

• Summary of the change / bug fix.
• Link # issue, if applicable.
• Screenshot of the feature or the bug before/after fix, if applicable.
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How has this been tested?

Personal testing. This is just a git addition and affects development operations.

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Checklist:

• Update our Hugo documentation following these guidelines.
• Update our tests following these guidelines.
• Make sure you are following our CONTRIBUTING guidelines.
• If a feature was added make sure to add it to the corresponding scripts file.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My code passes all the checks pylint, flake8, black, ... To speed up development you should run pre-commit install.
• New and existing unit tests pass locally with my changes. You can test this locally using pytest tests/....

[jfarid27]

One line of fixes really. Just add this to the .gitignore.