ci: scope down GitHub Token permissions

[AdnaneKhan]

Scope Down GitHub Token Permissions

This PR updates GitHub Actions workflows to use minimal required permissions instead of the default elevated permissions.

Why This Matters

Following the principle of least privilege, workflows should only have the specific permissions they need to function.

Changes

This PR adds explicit permissions: blocks to workflows that currently rely on default permissions, scoping them down to only what's required for their operations.

Please review the changes to ensure the specified permissions match your workflow requirements.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.88%. Comparing base (82eab66) to head (82507ba).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5882      +/-   ##
==========================================
- Coverage   87.89%   87.88%   -0.02%     
==========================================
  Files         622      622              
  Lines       46478    46478              
  Branches     7614     7614              
==========================================
- Hits        40854    40848       -6     
- Misses       5624     5630       +6     

Flag	Coverage Δ
unittests	87.88% <ø> (-0.02%)	⬇️

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