Follow-up #926: Add the test for jupyterlab exntension build

[c-bata]

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Reference Issues/PRs

Refs #926

What does this implement/fix? Explain your changes.

Fix the build error of the jupyter lab extension.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.00%. Comparing base (6e5ddc7) to head (999cd98).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #969   +/-   ##
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  Coverage   70.00%   70.00%           
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  Files          35       35           
  Lines        2387     2387           
=======================================
  Hits         1671     1671           
  Misses        716      716           

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[porink0424]

LGTM!

I have confirmed that the builds for tslib (types, storage, react), standalone_app, optuna_dashboard, and vscode are successful and that there are no incorrect behaviors.

For jupyterlab, I verified that running jupyter lab works with:

• the version installed via pip install -e .
• the version installed via locally built sdist

However, it seems jlpm build command mentioned in jupyterlab/README.md does not work as expected for now. This will likely require a follow-up to address the issue later.