* RBAC: Make the SplitScope migration concurrent
* Benchmark multiple alternatives: (updates in a loop, batch update, concurrent batch update)
* Only keep batching since mysql 5.7 does not seem to support concurrent batching
* Update pkg/services/accesscontrol/migrator/migrator.go
Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>
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Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>