Due to wrong order of stopping of compaction services, shutdown needs
to wait until all compactions are complete, which may take really long.
Moreover, test version of compaction manager does not abort task manager,
which is strictly bounded to it, but stops its compaction module. This results
in tests waiting for compaction task manager's tasks to be unregistered,
which never happens.
Stopping and aborting of compaction manager and task manager's compaction
module are performed in a proper order.
Closes#14461
* github.com:scylladb/scylladb:
tasks: test: abort task manager when wrapped_compaction_manager is destructed
compaction: swap compaction manager stopping order
compaction: modify compaction_manager::stop()
968421a3e0