validation: Disable CheckForkWarningConditions for background chainstate #284

Job	Run time
test each commit	0s
macOS 14 native, arm64, no depends, sqlite only, gui	28m 31s
Win64 native, VS 2022	1h 15m 8s
ASan + LSan + UBSan + integer, no depends, USDT	1h 19m 15s
	3h 2m 54s

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