chore: clean up feature activation logs

[glevco]

Motivation

Now that the Feature Activation Phased Testing has ended, we can remove some extra logs. Feature states are now logged together with the existing new block log. There's a small performance gain for removing the overhead of doubling logs.

Acceptance Criteria

• Remove feature activation specific logging methods and move logging of feature states to _log_new_object().

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.87%. Comparing base (97cb18e) to head (01bd409).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1035      +/-   ##
==========================================
- Coverage   84.88%   84.87%   -0.01%     
==========================================
  Files         297      297              
  Lines       22917    22906      -11     
  Branches     3466     3463       -3     
==========================================
- Hits        19453    19442      -11     
- Misses       2776     2777       +1     
+ Partials      688      687       -1     

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