chore: Remove clearlinux from os package testing

[salome-voltz]

Context

This merge request removes Clear Linux from the OS package testing workflow in our CI pipeline.
Intel has officially discontinued the project.

[cursor]

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Bug: Incomplete Removal of ClearLinux Support

The clearlinux case was removed from the test matrix and "Install requirements" step, but its handling remains in the "Setup" step. This creates dead code that will never execute, indicating an incomplete removal of clearlinux support.

.github/workflows/build_release_assets.yml#L313-L350

https://github.com/GitGuardian/ggshield/blob/fc2c23dfa4df45e475b57b86c6cce3fa35a571a6/.github/workflows/build_release_assets.yml#L313-L350

 

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.95%. Comparing base (e521aaf) to head (fc2c23d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1131   +/-   ##
=======================================
  Coverage   91.95%   91.95%           
=======================================
  Files         144      144           
  Lines        6166     6166           
=======================================
  Hits         5670     5670           
  Misses        496      496           

Flag	Coverage Δ
unittests	91.95% <ø> (ø)

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