validation: Disable CheckForkWarningConditions for background chainstate #282

Job	Run time
Win64 native, VS 2022	2h 22m 40s
ASan + LSan + UBSan + integer, no depends, USDT	1h 18m 5s
macOS 14 native, arm64, no depends, sqlite only, gui	28m 3s
test each commit	0s
	4h 8m 48s

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