Pipe: merge batched aligned chunks in scan parser #29854

Job	Run time
unit-test (17, windows-latest, datanode)	4m 44s
unit-test (17, windows-latest, others)	4m 47s
unit-test (17, ubuntu-latest, datanode)	2m 41s
unit-test (17, ubuntu-latest, others)	2m 58s
	15m 10s

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