Shut down unused kernels

[NexVeridian]

References

closes #13916

Code changes

Adds a button to Shut Down Unused kernels

User-facing changes

Backwards-incompatible changes

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[krassowski]

Thank you for working on this!

• It looks like there are conflicts which need to be resolved, these seem to prevent CI from running
• can you add a screenshot to the top-level comment?
• "only show button in kernels section" - shall we allow IRunningSessions.IManager to contribute arbitrary buttons to the section toolbars?

[krassowski]

This is looking better - leaving some more feedback on this iteration.

[krassowski]

From a quick glance the logic looks all good now. The last thing I would suggest is using an icon instead of text for this button. Let's first choose and add an icon to the command. I think some kind of material design icon for cleaning could do?

Suggested change

	id: SHUTDOWN_UNUSED_BUTTON_CLASS,
	icon: someIcon,
	id: SHUTDOWN_UNUSED_BUTTON_CLASS,

[NexVeridian]

I added one, I don't see very many options for icons

I manually added it to /jupyterlab/packages/ui-components/src/icon/iconimports.ts which needs to be fixed since it's supposed to be auto-generated

Should the text for Shut Down All and Shut Down Unused be removed, and just have icons instead, since there's not that much room