Fix possible incorrect result of aggregate function uniqExact

[CurtizJ]

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• Bug Fix (user-visible misbehavior in an official stable release)

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Fix possible incorrect result of aggregate function uniqExact.

[CurtizJ]

The issue was that #57872 introduced an optimization that calls addBatchSinglePlace instead of addBatch. But it's not applicable for uniqExact function with parallel merging (optimization implemented in #43072). So let's just disable the first optimization for uniqExact (addBatchSinglePlace and addBatch doesn't differ much in performance for uniqExact anyway).

[robot-ch-test-poll1]

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[CurtizJ]

Profile event AggregationProcessedBlocks slowed down test aggregation_by_partitions, so I removed it.

[adrian17]

I think we've just hit this issue (wrong uniqExact results, setting min_hit_rate_to_use_consecutive_keys_optimization=1.1 fixes it).

Is there any chance that we'd see a new 24.2 series release with the backported fix?
For now we've going to disable the optimization with the setting above, but we'd rather stay on a 24.2 series for a while longer instead of immediately bumping to 24.3 LTS (as we've seen some minor issues on it, didn't get to report them yet)