Fix RegionGroupCache activation race #30198

Job	Run time
unit-test (17, windows-latest, others)	21m 11s
unit-test (17, windows-latest, datanode)	43m 29s
unit-test (17, ubuntu-latest, others)	15m 43s
unit-test (17, ubuntu-latest, datanode)	28m 58s
	1h 49m 21s

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