opensci, sciencecore: startup jupyterlab instead of classic UI by default

[consideRatio]

Is JupyterLab preferred over the classic UI view for the "Pangeo notebook image" and "Jupyter SciPy Notebook" image choices? This PR makes it so if approved.

Ping @kyttmacmanus and @jmunroe

[github-actions]

Merging this PR will trigger the following deployment actions.

Support and Staging deployments

Cloud Provider	Cluster Name	Upgrade Support?	Reason for Support Redeploy	Upgrade Staging?	Reason for Staging Redeploy
aws	opensci	No		Yes	Following prod hubs require redeploy: sciencecore

Production deployments

Cloud Provider	Cluster Name	Hub Name	Reason for Redeploy
aws	opensci	sciencecore	Following helm chart values files were modified: sciencecore.values.yaml

[yuvipanda]

With #3972, this can be self merged

[consideRatio]

Its not on request from the community though, its my own initiative thinking its desired on sciencecore

[kyttmacmanus]

I am sorry for the slow reply. My sciencecore project will use a mix of Jupyter and Quarto notebooks, but I am not sure what the other sciencecore projects are using. I personally do like the jupyterhub default view but would defer to @jmunroe on an answer to your question.

[jmunroe]

I agree that /lab is a better default for those images.

[consideRatio]

Thank you @kyttmacmanus and @jmunroe!!