src/vs/platform/userDataSync/common/userDataSyncService.ts/ProfileSynchronizer/deRegisterSynchronizer
class ProfileSynchronizer:	private deRegisterSynchronizer(syncResource: SyncResource): void {
		const index = this._enabled.findIndex(([synchronizer]) => synchronizer.resource === syncResource);
		if (index !== -1) {
			const [[synchronizer, , disposable]] = this._enabled.splice(index, 1);
			disposable.dispose();
			this.updateStatus();
			Promise.allSettled([synchronizer.stop(), synchronizer.resetLocal()])
				.then(null, error => this.logService.error(error));
		}
	}