MongoDB | 2623652

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By default, the resharding transaction cloner only writes down its progress every 1000 entries. In stepdown suites, a failover is triggered every 8 seconds. In very slow variants (e.g. tsan debug), the cloner might be unable to process enough records to reach a checkpoint where progress is persisted before the next failover occurs, leaving it unable to make any progress (see BF-32013 for an example of this in practice). We should reduce the batch size to 1 in stepdown suites to guarantee that the cloner is able to make progress, even if the system is very slow.

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