PR https://github.com/scylladb/scylladb/pull/18186 introduced a fiber that reloads reclaimed bloom filters when memory becomes available. Use maintenance scheduling group to run that fiber instead of running it in the main scheduling group.
Fixes#18675Closesscylladb/scylladb#18721
* github.com:scylladb/scylladb:
sstables_manager: use maintenance scheduling group to run components reload fiber
sstables_manager: add member to store maintenance scheduling group