Move and Rustfmt channel acceptance and type downgrade tests#3797

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carlaKC wants to merge 10 commits intolightningdevkit:mainfrom

carlaKC:refactor-chantype-tests

Commits on Jun 4, 2025

ln/refactor: add helper test function for channel type downgrade
carlaKC
committed
ln/refactor: use get_initial_channel_type for channel downgrade
carlaKC
committed
ln+util: add test option to enable negotiation of zero fee channels

carlaKC
and
TheBlueMatt
committed
ln/refactor: add helper function for channel type tests
carlaKC
committed
ln: do not set or accept non-zero feerates in open_channel for v3

carlaKC
and
TheBlueMatt
committed
ln/refactor: add helper function for manual acceptance tests
carlaKC
committed
ln: do not automatically accept zero fee commitment channels
carlaKC
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ln: set `max_htlcs` based on the channel type

TheBlueMatt
authored and
carlaKC
committed
ln/refactor: move channelmanager acceptance tests to separate file
carlaKC
committed
ln/format: rust format channel_acceptance_tests
carlaKC
committed