chore: remove obsolete Python setup workflow

[thibaultcordier]

• Deleted the .github/workflows/setup-python.yml file as it is no longer needed for the CI/CD pipeline.

[Copilot]

Pull Request Overview

This PR removes an obsolete reusable GitHub Actions workflow for setting up Python environments that is no longer needed in the CI/CD pipeline.

• Deleted the entire .github/workflows/setup-python.yml workflow file
• Removes Python environment setup, dependency caching, and uv installation steps
• Cleans up unused CI/CD infrastructure

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 30.27%. Comparing base (6ba06bb) to head (005a944).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #2   +/-   ##
=======================================
  Coverage   30.27%   30.27%           
=======================================
  Files          14       14           
  Lines         621      621           
=======================================
  Hits          188      188           
  Misses        433      433           

Flag	Coverage Δ
unittests	30.27% <ø> (ø)

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