src/vs/workbench/api/browser/mainThreadNotebookKernels.ts/MainThreadNotebookKernels/$completeExecution
class MainThreadNotebookKernels:	$completeExecution(handle: number, data: SerializableObjectWithBuffers<ICellExecutionCompleteDto>): void {
		try {
			const execution = this._executions.get(handle);
			if (execution) {
				execution.complete(NotebookDto.fromCellExecuteCompleteDto(data.value));
			}
		} catch (e) {
			onUnexpectedError(e);
		} finally {
			this._executions.delete(handle);
		}
	}