CI: add clang-tidy job

[SimeonEhrig]

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[SimeonEhrig]

I'm not sure, if this apt package is enough.

It installs the executable clang-tidy-<version> (e.g. clang-tidy-21). Maybe we need to create the file link clang-tidy, which points to clang-tidy-<version>, that CMake can find it.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.09%. Comparing base (ce2641f) to head (1d762d7).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #659   +/-   ##
=======================================
  Coverage   73.09%   73.09%           
=======================================
  Files         123      123           
  Lines        3334     3334           
  Branches      917      917           
=======================================
  Hits         2437     2437           
  Misses        145      145           
  Partials      752      752           

Flag	Coverage Δ
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