This reverts commitb0643f8959, reversing changes made toe8b0f8faa9. The change forgot to update sstables_manager::get_highest_supported_format(), which results in /system/highest_supported_sstable_version still returning me, confusing and breaking tests. Fixes: scylladb/scylla-dtest#6435 Closes scylladb/scylladb#27379