src/vs/platform/userDataSync/common/userDataSyncService.ts/Synchronizers/deRegisterSynchronizer
class Synchronizers:	private deRegisterSynchronizer(syncResource: SyncResource): void {
		const index = this._enabled.findIndex(([synchronizer]) => synchronizer.resource === syncResource);
		if (index !== -1) {
			const removed = this._enabled.splice(index, 1);
			for (const [synchronizer, , disposable] of removed) {
				if (synchronizer.status !== SyncStatus.Idle) {
					const hasConflicts = synchronizer.conflicts.length > 0;
					synchronizer.stop();
					if (hasConflicts) {
						this.onDidChangeConflicts(this.enabled);
					}
					this.onDidChangeStatus(this.enabled);
				}
				disposable.dispose();
			}
		}
	}