test: locking -testdatadir when not specified and then deleting lock … #438

Job	Run time
ASan + LSan + UBSan + integer, no depends, USDT	1h 8m 14s
macOS 14 native, arm64, no depends, sqlite only, gui	10m 35s
test each commit	0s
Win64 native, VS 2022	30m 21s
	1h 49m 10s

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