cmake: Adjust `test/README.md` instructions #2926

Job	Run time
macOS 13 native, x86_64, no depends, sqlite only, gui	3m 38s
Win64 native, VS 2022	24m 2s
ASan + LSan + UBSan + integer, no depends, USDT	26m 34s
test each commit	0s
	54m 14s

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