chore: make also cache-tests integrated as a submodule

[Uzlopak]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.53%. Comparing base (c2da306) to head (47d1fb4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4517   +/-   ##
=======================================
  Coverage   93.53%   93.53%           
=======================================
  Files         103      103           
  Lines       32362    32362           
=======================================
  Hits        30270    30270           
  Misses       2092     2092           

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