contractcourt+sweep: fix fee function and deadline issue

[yyforyongyu]

Fixes #8741 Fixes #8738

TODO:

• [ ] fix itest

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[yyforyongyu]

@morehouse Yeah the itest failure is annoying, don't think it can be properly fixed until blockbeat is in. Here's some logs which show that the subsystems have very different views of block heights,

2024-05-18 04:24:15.394 [DBG] SWPR: Received new block: height=476, attempt sweeping 0 inputs
...
2024-05-18 04:24:15.418 [INF] CNCT: *contractcourt.htlcSuccessResolver(ee04c77ad329073b6b7e1899e0173aa6c1835727f647b0853099fc7dcc6e0d2b): offering second-level success tx output to sweeper with no deadline and budget=0.00050000 BTC at height=471
...
2024-05-18 04:24:15.418 [INF] SWPR: Sweep request received: out_point=e0749b9458c5f6693eb79b6a6293feb44435467b2a68680185921f0d86425805:0, witness_type=HtlcAcceptedSuccessSecondLevel, relative_time_lock=4, absolute_time_lock=0, amount=0.00100000 BTC, parent=(<nil>), params=(startingFeeRate={false 0}, immediate=false, exclusive_group=none, budget=0.00050000 BTC, deadline=none)
2024-05-18 04:24:15.418 [INF] CNCT: *contractcourt.htlcSuccessResolver(ee04c77ad329073b6b7e1899e0173aa6c1835727f647b0853099fc7dcc6e0d2b): waiting for second-level HTLC output to be spent after csv_delay=4
...
2024-05-18 04:24:15.418 [DBG] SWPR: TxPublisher received new block: 471

As for now, I did an extra check in the test to make it pass. More work to do in 18.1, as I wanna fix these multi-hop tests so it's easier to maintain in the future.