sweep: use p2tr output as change weight

[Crypt-iQ]

We now use p2tr outputs as change

Fixes #7893

[ziggie1984]

Good catch! LGTM

Some minor nits:

1. Add a comment to the DustLimitForSize for P2TR which you propose in incorrect use of p2wkh weight #7893
2. Update the ChangeScript comment here for P2TR:

   lnd/server.go

   Lines 4662 to 4663 in ac9ca02

   	// Specifically, the script generated is a version 0, pay-to-witness-pubkey-hash
   	// (p2wkh) output.

   
   and here:

   lnd/sweep/sweeper.go

   Lines 248 to 249 in ac9ca02

   	// GenSweepScript generates a P2WKH script belonging to the wallet where
   	// funds can be swept.

3. Missing Release-Docs.

[yyforyongyu]

Pending a release note📝

[lightninglabs-deploy]

@Crypt-iQ, remember to re-request review from reviewers when ready

[guggero]

I guess we can skip the release notes for this one.