core: integrate DutySyncContribution

[xenowits]

Integrate DutySyncContribution into core workflow. Also, test on simnet.

category: feature
ticket: #1268

[codecov]

Codecov Report

Base: 53.50% // Head: 53.35% // Decreases project coverage by -0.14% ⚠️

Coverage data is based on head (3dfee37) compared to base (c7d1bc8).
Patch coverage: 3.12% of modified lines in pull request are covered.

❗ Current head 3dfee37 differs from pull request most recent head f7191ab. Consider uploading reports for the commit f7191ab to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1388      +/-   ##
==========================================
- Coverage   53.50%   53.35%   -0.15%     
==========================================
  Files         145      145              
  Lines       18041    18119      +78     
==========================================
+ Hits         9652     9667      +15     
- Misses       7060     7126      +66     
+ Partials     1329     1326       -3     

Impacted Files	Coverage Δ
app/eth2wrap/httpwrap.go	0.00% <0.00%> (ø)
core/interfaces.go	0.00% <0.00%> (ø)
core/signeddata.go	44.12% <ø> (ø)
testutil/beaconmock/attestation.go	85.71% <ø> (ø)
testutil/beaconmock/beaconmock.go	49.15% <0.00%> (ø)
testutil/beaconmock/options.go	34.41% <0.00%> (-1.36%)	⬇️
testutil/validatormock/attest.go	58.49% <0.00%> (ø)
testutil/validatormock/synccomm.go	0.00% <0.00%> (ø)
app/vmock.go	79.25% <66.66%> (+3.31%)	⬆️
core/validatorapi/validatorapi.go	58.32% <100.00%> (ø)
... and 6 more

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