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This commit integrates retention leases with recovery. With this change, we copy the current retention leases on primary to the replica during phase two of recovery. At this point, the replica will have been added to the replication group and so is already receiving retention lease sync requests from the primary. This means that if any retention lease syncs are triggered on the primary after we sample the retention leases here during phase two, that sync request will also arrive on the replica ensuring that the replica is from this point on up to date with the retention leases on the primary. We have to copy these during phase two since we will be applying indexing operations, potentially triggering merges, and therefore must ensure the correct retention leases are in place beforehand.