Resolve forward HTLC fails via `MonitorEvent`s #23476

Job	Run time
benchmark	17m 53s
fuzz_sanity	11m 35s
rustfmt	20s
linting	2m 37s
ext-test	7m 45s
fuzz	1h 30m 6s
build-bindings / build (self-hosted, 1.75.0)	21m 19s
build-features / build (self-hosted, 1.75.0)	31m 14s
build-cfg-flags / build (self-hosted, 1.75.0)	20m 5s
build-workspace / build (self-hosted, 1.75.0)	20m 27s
tor-connect	7m 54s
build-sync / build (self-hosted, 1.75.0)	22m 42s
check_release	2m 52s
build-nostd / build (self-hosted, 1.75.0)	17m 4s
check_docs	5m 40s
coverage	0s
notify-failure	0s
	4h 39m 33s

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