Avoid small batches in Exchange #15938

Job	Run time
Build	44m 57s
Build with Clang	0s
Spark Aggregate Fuzzer	15m 42s
Presto Bias Fuzzer	0s
Cache Fuzzer	15m 35s
Exchange Fuzzer	16m 21s
Presto Fuzzer	30m 46s
RowNumber Fuzzer	15m 51s
Spark Fuzzer	4m 2s
Spark Bias Fuzzer	0s
Join Fuzzer	17m 30s
Biased Aggregation Fuzzer with Presto as source of truth	0s
Aggregation Fuzzer with Presto as source of truth	22m 2s
Biased Expression Fuzzer with Only Added/Updated Functions and Presto as source of truth	0s
Window Fuzzer with Presto as source of truth	17m 26s
Writer Fuzzer with Presto as source of truth	17m 35s
Signature Changes	2s
	3h 37m 49s

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