Remove `DefaultChannelConstraints` from PartialChainControl and lnwallet.Config

[ProofOfKeags]

Change Description

In an investigation on how ChannelConstraints were used throughout the codebase (in preparation for dynamic commitments), I stumbled on some dead code/data structures. This PR trims them to the smallest used set. In theory this should result in no semantics changes.

Steps to Test

CI should handle finding any regressions

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Testing

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• [x] Tests covering the positive and negative (error paths) are included.
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[lightninglabs-deploy]

@roasbeef: review reminder

[ProofOfKeags]

Looks like the last three commits can be merged 🤔

🫡

[ProofOfKeags]

There may be more small cleanups to pull out of there if you're interested. https://github.com/lightningnetwork/lnd/pull/7210

@morehouse Big fan of the goal of your PR. Would you be interested in rebasing it and then I can add it to my review queue?

As for this change here, I did this because I was exploring the surface area of the usage of ChannelConstraints and found it in a place it doesn't belong. I'm doing this because a big chunk of the dynamic commitments work is related to channel constraints. So I do think that pulling in more of your changes would be out of scope for that.

[morehouse]

Would you be interested in rebasing it and then I can add it to my review queue?

Eventually, maybe. It's been awhile, so I probably need to self-review it first. Unfortunately, it's not a high priority for me anymore.