Add option to dismiss dialog

[RRosio]

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References

Related to https://github.com/jupyterlab/jupyterlab/issues/8374

Code changes

This PR uses the showDialog function to display an error message with a checkbox giving the user the option to dismiss the popup dialog for the remainder of their tab session.

User-facing changes

The user will now see a clickable checkbox that allows them to dismiss the error dialog informing them their connection to the server was lost.

Backwards-incompatible changes

Not applicable

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[RRosio]

Thank you for your review @JasonWeill! OH I think I missed checking for that but I will update this with the appropriate fix for that, thank you for letting me know!

[RRosio]

I am not sure that the failing CI job, check_release is related to these changes. I have seen it fail for at least one other dependabot PR with a few pip dependency updates.

[krassowski]

The check_release failure is unrelated, tracking it here: https://github.com/jupyterlab/jupyterlab/issues/16448

[krassowski]

@RRosio is it ready for review?

[RRosio]

@krassowski, it should be ready for review now!