core: replace BlockReverseOps with a Reversible conformance

[superlopuh]

Turns out there's a neat built-in way to get the expected behaviour.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.78%. Comparing base (f8834ad) to head (3b9b498).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2792      +/-   ##
==========================================
- Coverage   89.79%   89.78%   -0.01%     
==========================================
  Files         384      385       +1     
  Lines       48442    48477      +35     
  Branches     7429     7433       +4     
==========================================
+ Hits        43497    43526      +29     
  Misses       3781     3781              
- Partials     1164     1170       +6     

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