src/vs/workbench/contrib/notebook/browser/services/notebookKernelServiceImpl.ts/NotebookKernelService/dispose
class NotebookKernelService:	override dispose() {
		this._kernels.clear();
		this._kernelSources.forEach(v => {
			v.menu.dispose();
			v.actions.forEach(a => a[1].dispose());
		});
		super.dispose();
	}