Remove kaminari-activerecord from solidus_core

[tvdeyen]

Summary

All transient gems that actually use Kaminari for pagination have it as dependency and this is the right call. Depending on kaminari in core does not make any sense, since core does not hold controllers nor views.

Checklist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.66%. Comparing base (20161a3) to head (408b36b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6445   +/-   ##
=======================================
  Coverage   89.66%   89.66%           
=======================================
  Files         990      990           
  Lines       20792    20793    +1     
=======================================
+ Hits        18644    18645    +1     
  Misses       2148     2148           

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