core/tracker: improve participation

[dB2510]

Improves participation metric to count multiple duties per slot. For example, we can have multiple attester duties per slot.

category: feature
ticket: #2034

[codecov]

Codecov Report

Patch coverage: 72.72% and project coverage change: -0.39 ⚠️

Comparison is base (889cba4) 53.82% compared to head (6edf32d) 53.44%.

❗ Current head 6edf32d differs from pull request most recent head 3a31372. Consider uploading reports for the commit 3a31372 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2112      +/-   ##
==========================================
- Coverage   53.82%   53.44%   -0.39%     
==========================================
  Files         172      172              
  Lines       22282    22395     +113     
==========================================
- Hits        11994    11968      -26     
- Misses       8840     8970     +130     
- Partials     1448     1457       +9     

Impacted Files	Coverage Δ
core/tracker/tracker.go	79.91% <72.72%> (+0.65%)	⬆️

... and 11 files with indirect coverage changes

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