core: excessive logging fix

[pinebit]

Batch per-validator "Resolved attester duty" and "Resolved sync committee duty" log messages into a single summary log per epoch. With large clusters (~1000 validators), this reduces log output from ~1000 lines to a few chunked lines
while preserving pubkey information for debugging. Chunks stay within Loki's 4KB max log line limit.

category: refactor
ticket: none

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.26%. Comparing base (cc7427a) to head (5b17df7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4402      +/-   ##
==========================================
- Coverage   56.29%   56.26%   -0.04%     
==========================================
  Files         242      242              
  Lines       32196    32207      +11     
==========================================
- Hits        18125    18120       -5     
- Misses      11748    11763      +15     
- Partials     2323     2324       +1     

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