Fix workflows, build against JupyterLab 4, fix build TS 5 errors, lint

[krassowski]

Follow-up to jupyterlab-contrib/jupyterlab-contrib.github.io#74

• Aligns workflows with latest template (except for using master and using an older version of publishing workflows because I think we do not have a bot app setup here)
• Migrates to yarn3 lockfile
• Updates dependencies for JupyterLab 4 so that the extension can be easily built using a supported JupyterLab version
• Fixes linting errors @ts-ignore improving compatibility with less common but valid notebooks
• Fixes build error for new TypeScript version (errors are now unknown)

[krassowski]

Check release is failing because releaser does not know what to do with pip-deepfreeze:

[tool.hatch.envs.default]
type = "pip-deepfreeze"
features = ["dev", "test"]

[fcollonval]

Thanks a lot @krassowski

we do not have a bot app setup here

We do have a bot since a week 😉

I can set it up if you want - but you can already merge this one I guess.

[fcollonval]

Release environment set