Remove Gitlab::Redis::ClusterSessions post migration

Marco Gregoriusrequested to merge
mg-cleanup-redis-cluster-sessions-migration-helper into master

What does this MR do and why?

In gitlab-com/gl-infra/data-access/durability&9 (closed), we're migrating Redis Sessions (Redis sentinel) to a new Redis Cluster Sessions to horizontally scale the CPU.

Once the gprd migration gitlab-com/gl-infra/production#19252 (closed) is done, we can remove the migration helpers, Gitlab::Redis::ClusterSessions and its related feature flags.

Part of cleanup post migration in gitlab-com/gl-infra/data-access/durability/team#34

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Edited by Marco Gregorius

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