trampoline: accumulate inbound trampoline htlcs #22884

Job	Run time
ext-test	6m 14s
benchmark	19m 22s
check_release	3m 0s
rustfmt	13s
fuzz_sanity	11m 16s
linting	2m 28s
tor-connect	6m 3s
fuzz	33m 47s
build-features / build (self-hosted, 1.75.0)	33m 36s
build-nostd / build (self-hosted, 1.75.0)	14m 2s
build-workspace / build (self-hosted, 1.75.0)	12m 23s
build-bindings / build (self-hosted, 1.75.0)	20m 25s
build-cfg-flags / build (self-hosted, 1.75.0)	13m 41s
check_docs	5m 15s
build-sync / build (self-hosted, 1.75.0)	17m 50s
coverage	0s
notify-failure	0s
	3h 19m 35s

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