Optimize relational tablet batch inserts #30193

Job	Run time
unit-test (17, ubuntu-latest, others)	18m 8s
unit-test (17, windows-latest, others)	20m 15s
unit-test (17, windows-latest, datanode)	20m 9s
unit-test (17, ubuntu-latest, datanode)	19m 40s
	1h 18m 12s

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