trampoline: accumulate inbound trampoline htlcs #23331

Job	Run time
build-sync / build (self-hosted, 1.75.0)	20m 40s
linting	2m 31s
fuzz_sanity	12m 43s
check_docs	6m 58s
tor-connect	7m 44s
build-workspace / build (self-hosted, 1.75.0)	12m 27s
ext-test	7m 29s
build-nostd / build (self-hosted, 1.75.0)	19m 51s
fuzz	49m 16s
build-cfg-flags / build (self-hosted, 1.75.0)	6h 1m 4s
build-features / build (self-hosted, 1.75.0)	33m 40s
rustfmt	13s
benchmark	17m 34s
build-bindings / build (self-hosted, 1.75.0)	20m 19s
check_release	3m 33s
coverage	21m 19s
notify-failure	-1s
	9h 57m 20s

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