Fix MigratingSlot solve the cluster has been updated by others #372
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…ted by others when updateCluster
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In high-concurrency scenarios, when the kvrocks-controller receives a MigrateSlot request to update the cluster and The kvrocks node migration successfully updates the cluster（migrationLoop->tryUpdateMigrationStatus->UpdateCluster）, an update conflict exception will occur, reporting the error: "the cluster has been updated by others". To handle this exception, migration information should be preserved, and cluster updates should continue, rather than exiting without updating the cluster.