[chore][config/configopaque] Move implementation checks to test files

[atoulme]

Description:
Move implementation checks to test files. Reduces dependencies of the configopaque package.

[bogdandrutu]

@atoulme would be good to have an issue to change everywhere.

[atoulme]

@atoulme would be good to have an issue to change everywhere.

#9431 filed!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (abae649) 90.21% compared to head (3b11e8b) 90.18%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9430      +/-   ##
==========================================
- Coverage   90.21%   90.18%   -0.03%     
==========================================
  Files         345      345              
  Lines       18021    18019       -2     
==========================================
- Hits        16257    16251       -6     
- Misses       1435     1438       +3     
- Partials      329      330       +1     

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