Fix RegionGroupCache activation race #30173

Job	Run time
unit-test (17, ubuntu-latest, others)	19m 50s
unit-test (17, windows-latest, datanode)	33m 7s
unit-test (17, ubuntu-latest, datanode)	22m 45s
unit-test (17, windows-latest, others)	27m 54s
	1h 43m 36s

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