Clean up clang-tidy suppressions

[aobolensk]

Get rid of many tests (especially, googletest) related diagnostics suppressions, address all newly appeared clang-tidy remarks

[chatgpt-codex-connector]

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Reviewed commit: 648d72e3da

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.07%. Comparing base (5e0844e) to head (648d72e).

❗ There is a different number of reports uploaded between BASE (5e0844e) and HEAD (648d72e). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5e0844e)	HEAD (648d72e)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #784       +/-   ##
===========================================
- Coverage   93.13%   27.07%   -66.07%     
===========================================
  Files          15       15               
  Lines         495      495               
  Branches      185      180        -5     
===========================================
- Hits          461      134      -327     
- Misses          1      348      +347     
+ Partials       33       13       -20     

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