Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/14922
- Preserve source compatibility for `Scan::Reset` by restoring the default `reverse` argument.
- Make `HasMoreScanRanges()` defensive for reverse prepared scans instead of asserting.
- Restore broader forward coverage in `MultiScanAsyncIOTest` while keeping reverse coverage on the representative async IO matrix.
- Let `--multiscan_reverse` drive reverse MultiScan stress coverage independently of `--test_backward_scan`.
- Add the reverse MultiScan public API release note.
Reviewed By: xingbowang
Differential Revision: D111127403
fbshipit-source-id: 1a17d0a36aaf66e8cbc51f445d0f85e145fd653c
f32f747125