Pipe: fix manual IT pipe memory config #30106

Job	Run time
unit-test (17, windows-latest, others)	20m 51s
unit-test (17, ubuntu-latest, others)	15m 31s
unit-test (17, ubuntu-latest, datanode)	29m 31s
unit-test (17, windows-latest, datanode)	42m 16s
	1h 48m 9s

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