src/vs/platform/userDataSync/common/userDataSyncService.ts/ManualSyncTask/stop
class ManualSyncTask:	async stop(): Promise<void> {
		for (const synchroniser of this.synchronisers) {
			try {
				await synchroniser.stop();
			} catch (error) {
				if (!isPromiseCanceledError(error)) {
					this.logService.error(error);
				}
			}
		}
		this.reset();
	}