Use request actor for exclusive lease migration

What does this MR do and why?

Since the percentage of time rollout is deprecated, we are using the percentage of actors with request-based actor for migrating the exclusive lease workloads to the new Gitlab::Redis::ClusterSharedState instance.

The percentage of actors rollout will be used during production migration in gitlab-com/gl-infra/production#16446 (closed).

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.