Improve metadata OOM diagnostics #30138

Job	Run time
unit-test (17, ubuntu-latest, datanode)	29m 53s
unit-test (17, windows-latest, datanode)	40m 57s
unit-test (17, windows-latest, others)	21m 46s
unit-test (17, ubuntu-latest, others)	16m 6s
	1h 48m 42s

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