CheckEphemeralSpends: return boolean, and set child state and txid ou… #432

Job	Run time
ASan + LSan + UBSan + integer, no depends, USDT	36m 39s
macOS 14 native, arm64, no depends, sqlite only, gui	12m 19s
Win64 native, VS 2022	58m 2s
test each commit	0s
	1h 47m 0s

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