Currently, all apis that start a compaction have two versions:
synchronous and asynchronous. They share most of the implementation,
but some checks and params have diverged.
Unify the handlers of synchronous and asynchronous cleanup, major
compaction, and upgrade_sstables.
Fixes: https://github.com/scylladb/scylladb/issues/26715.
Requires backports to all live versions
Closesscylladb/scylladb#26746
* github.com:scylladb/scylladb:
api: storage_service: tasks: unify upgrade_sstable
api: storage_service: tasks: force_keyspace_cleanup
api: storage_service: tasks: unify force_keyspace_compaction