Assert peer supports splicing before splicing channel

[tankyleo]

No description provided.

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[tankyleo]

Question: if a peer connects to us with splicing on, and quiesence off, should we immediately disconnect ?

[TheBlueMatt]

Oops lol

[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.33%. Comparing base (109f715) to head (cdba25f).

Files with missing lines	Patch %	Lines
lightning/src/ln/splicing_tests.rs	95.55%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4262      +/-   ##
==========================================
+ Coverage   89.30%   89.33%   +0.03%     
==========================================
  Files         180      180              
  Lines      139057   139111      +54     
  Branches   139057   139111      +54     
==========================================
+ Hits       124182   124273      +91     
+ Misses      12247    12209      -38     
- Partials     2628     2629       +1     

Flag	Coverage Δ
fuzzing	34.99% <45.45%> (-0.01%)	⬇️
tests	88.69% <96.42%> (+0.03%)	⬆️

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[tankyleo]

@TheBlueMatt is that a backport to 0.2 ?