fix(state): update average score calculation

[b00f]

Description

This PR updates the average availability calculation and removes unbonded validators from the calculation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.36%. Comparing base (86a8ba9) to head (03ccd5e).
⚠️ Report is 348 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2139      +/-   ##
==========================================
- Coverage   75.07%   71.36%   -3.72%     
==========================================
  Files         234      294      +60     
  Lines       12156    18391    +6235     
==========================================
+ Hits         9126    13124    +3998     
- Misses       2582     4727    +2145     
- Partials      448      540      +92     

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