src/vs/workbench/contrib/notebook/browser/notebookExecutionStateServiceImpl.ts/NotebookExecutionListeners/cancelAll
class NotebookExecutionListeners:	private cancelAll(): void {
		this._logService.debug(`NotebookExecutionListeners#cancelAll`);
		const exes = this._notebookExecutionStateService.getCellExecutionStatesForNotebook(this._notebookModel.uri);
		this._notebookExecutionService.cancelNotebookCellHandles(this._notebookModel, exes.map(exe => exe.cellHandle));
	}