TemporaryHashes.db is a temporary sstable component used during ms
sstable writes. It's different from other sstable components in that
it's not included in the TOC. Because of this, it has a special case in
the logic that deletes unfinished sstables on boot.
(After Scylla dies in the middle of a sstable write).
But there's a bug in that special case,
which causes Scylla to forget to delete other components from the same unfinished sstable.
The code intends only to delete the TemporaryHashes.db file from the
`_state->generations_found` multimap, but it accidentally also deletes
the file's sibling components from the multimap. Fix that.
Also, extend a related test so that it would catch the problem before the fix.
Fixes scylladb/scylladb#26393
Bugfix, needs backport to 2025.4.
- (cherry picked from commit 16cb223d7f)
- (cherry picked from commit 6efb807c1a)
Parent PR: #26394Closesscylladb/scylladb#26409
* github.com:scylladb/scylladb:
sstables/sstable_directory: don't forget to delete other components when deleting TemporaryHashes.db
test/boost/database_test: fix two no-op distributed loader tests
034845e6eb