message: fix(r11s-driver): don't return latest for cached snapshot id
diff: @@ -171,7 +171,7 @@ export class WholeSummaryDocumentStorageService implements IDocumentStorageServi
  private async fetchAndCacheSnapshotTree(versionId: string): Promise<{ id: string, snapshotTree: ISnapshotTree }> {
  const cachedSnapshotTree = await this.snapshotTreeCache.get(versionId);
  if (cachedSnapshotTree !== undefined) {
  - return { id: versionId, snapshotTree: cachedSnapshotTree };
  + return { id: cachedSnapshotTree.id!, snapshotTree: cachedSnapshotTree };
  }
  const wholeFlatSummary = await PerformanceEvent.timedExecAsync(
  