core: revert core interfaces

[xenowits]

Revert changes to core interfaces.

This is done since the deneb upgrade no longer requires multiple signatures per signed object. Reverting to the original implementation makes the interfaces simple and code much easier to reason about.

category: refactor
ticket: #2659

[codecov]

Codecov Report

Attention: 32 lines in your changes are missing coverage. Please review.

Comparison is base (7172fb6) 53.06% compared to head (5965599) 53.42%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2682      +/-   ##
==========================================
+ Coverage   53.06%   53.42%   +0.35%     
==========================================
  Files         202      202              
  Lines       27999    27780     -219     
==========================================
- Hits        14858    14841      -17     
+ Misses      11282    11099     -183     
+ Partials     1859     1840      -19     

Files	Coverage Δ
cmd/createcluster.go	59.82% <100.00%> (ø)
core/eth2signeddata.go	80.95% <100.00%> (+23.40%)	⬆️
core/fetcher/fetcher.go	68.38% <100.00%> (ø)
core/parsigdb/memory.go	53.90% <100.00%> (ø)
core/proto.go	63.29% <100.00%> (-0.96%)	⬇️
core/tracker/tracker.go	79.51% <100.00%> (ø)
core/types.go	27.07% <ø> (ø)
dkg/dkg.go	57.12% <100.00%> (ø)
core/sigagg/sigagg.go	62.02% <60.00%> (-1.71%)	⬇️
core/signeddata.go	47.83% <73.46%> (+7.50%)	⬆️

... and 8 files with indirect coverage changes

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[dB2510]

why the hell sonarlint failing 😂

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
13.2% Duplication

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[gsora]

lfg

also we should have a synchronous session to review sonarcloud's rules