✨ Upgrade sidepanel extension to JupyterLab 4.x compatibility [DO NOT MERGE]

[Chenzo1001]

Updated all @jupyterlab/* dependencies to v4.x
Adapted to breaking API changes (SessionContext, TypeScript types, etc.)
Fixed strict type checking errors introduced in TS 4.x
Requires Node 16+ and updated dependencies
Upgrade to React 18+

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[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[liferoad]

Does this still work with 3.x? we will need to release this later as well.

[Chenzo1001]

Does this still work with 3.x? we will need to release this later as well.

I build it with 3.x and it failed. Because the version of @jupyterlab/builder can't be compatible between 3.x and 4.x. I can rename these files to *.v3.js and *.v4.js, then add scripts to select the builder version. But I think maybe switch to 4.x is a better choice. 😁

[github-actions]

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[nika-qubit]

LGTM

[damccorm]

Thanks!

[damccorm]

Actually, looks like this is causing precommit failures, could you please take a look? https://github.com/apache/beam/actions/runs/14197749402/job/39777121469

[liferoad]

Do not merge this PR. Please wait for me to LGTM.

[Chenzo1001]

Actually, looks like this is causing precommit failures, could you please take a look? https://github.com/apache/beam/actions/runs/14197749402/job/39777121469

The testsuites and CI scripts are also needed to be upgrade. I'll commit my changes later this day.

[Chenzo1001]

@liferoad @damccorm Hi I've finished updating packages. Please review my changes.