Fix max data region group quota calculation #30588

Job	Run time
unit-test (17, windows-latest, datanode)	34m 5s
unit-test (17, ubuntu-latest, others)	20m 52s
unit-test (17, ubuntu-latest, datanode)	28m 34s
unit-test (17, windows-latest, others)	28m 50s
unit-test (17, windows-latest, datanode)	34m 27s
unit-test (17, windows-latest, others)	28m 50s
unit-test (17, ubuntu-latest, others)	20m 52s
unit-test (17, ubuntu-latest, datanode)	28m 34s
	3h 45m 4s

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