ci: split lint job into lint and sast

[gruebel]

This PR

• typically CodeQL scanning takes longer than other steps, therefore it is better to have a dedicated job for it
• also removed the Install dependencies step, because there are no dependencies needed for scanning the project (this could change in the future and then it would make sense to split into 2 different requirements.txt files or use something like poetry to handle dev and runtime dependencies)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b3c67b6) 93.83% compared to head (d81b8d5) 93.83%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #256   +/-   ##
=======================================
  Coverage   93.83%   93.83%           
=======================================
  Files          16       16           
  Lines         438      438           
=======================================
  Hits          411      411           
  Misses         27       27           

Flag	Coverage Δ
unittests	93.83% <ø> (ø)

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[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[federicobond]

What do you think about running CodeQL only for merged commits (on main branch)?

[gruebel]

From my experience it is usually too late. If you for example added some suspicious code, then it is merged and flagged, and you will need to either exclude those lines or fix them in a follow-up PR.