Currently `sstable_requiring_cleanup` is updated using `compacting_sstable_registration`, but that mechanism is not used by offstrategy compaction, leading to #14304.
This series introduces `compaction_manager::on_compaction_completion` that intercepts the call
to the table::on_compaction_completion. This allows us to update `sstable_requiring_cleanup` right before the compacted sstables are deleted, making sure they are no leaked to `sstable_requiring_cleanup`, which would hold a reference to them until cleanup attempts to clean them up.
`cleanup_incremental_compaction_test` was adjusted to observe the sstables `on_delete` (by adding a new observer event) to detect the case where cleanup attempts to delete the leaked sstables and fails since they were already deleted from the file system by offstrategy compaction. The test fails with the fix and passes with it.
Fixes#14304Closes#14858
* github.com:scylladb/scylladb:
compaction_manager: on_compaction_completion: erase sstables from sstables_requiring_cleanup
compaction/leveled_compaction_strategy: ideal_level_for_input: special case max_sstable_size==0
sstable: add on_delete observer
compaction_manager: add on_compaction_completion
sstable_compaction_test: cleanup_incremental_compaction_test: verify sstables_requiring_cleanup is empty
108e510a23