src/vs/platform/userDataSync/common/userDataSyncService.ts/UserDataSyncService/resetLocal
class UserDataSyncService:	async resetLocal(): Promise<void> {
		await this.checkEnablement();
		this.storageService.remove(LAST_SYNC_TIME_KEY, StorageScope.GLOBAL);
		for (const synchroniser of this.synchronisers) {
			try {
				await synchroniser.resetLocal();
			} catch (e) {
				this.logService.error(`${synchroniser.resource}: ${toErrorMessage(e)}`);
				this.logService.error(e);
			}
		}
		this._onDidResetLocal.fire();
		this.logService.info('Did reset the local sync state.');
	}