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d4c28ee317
During raft-topology upgrade in 2026.1, service_level_controller::migrate_to_v2() returns early when system_distributed.service_levels is empty. This skips the service_level_version = 2 write, so the cluster is never marked as upgraded to service levels v2 even though there is no data to migrate. Subsequent upgrades may then fail the startup check which requires service_level_version == 2.
Remove the early return and let the migration commit the version marker even when there are no legacy service levels rows to copy.
Fixes: https://scylladb.atlassian.net/browse/SCYLLADB-1198
backport: should be backported to all versions that can be upgraded to 2026.2
Closes scylladb/scylladb#29333
* github.com:scylladb/scylladb:
test/auth_cluster: cover empty legacy table in service level upgrade
service_levels: mark v2 migration complete on empty legacy table
(cherry picked from commit 95e422db48)
Closes scylladb/scylladb#29352