core/sigagg: test for builder registration

[ciaranmcveigh5]

• Test for builder registration
• builder proposer typo on duty - was DutyProposer should be DutyBuilderProposer

can split these into 2 separate PR if needed

category: feature
ticket: #849

[codecov]

Codecov Report

Merging #884 (d3df65c) into main (e7e9998) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #884      +/-   ##
==========================================
- Coverage   54.81%   54.75%   -0.06%     
==========================================
  Files         114      114              
  Lines       12231    12231              
==========================================
- Hits         6704     6697       -7     
- Misses       4566     4572       +6     
- Partials      961      962       +1     

Impacted Files	Coverage Δ
dkg/transport.go	53.70% <0.00%> (-12.97%)	⬇️

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