Run CodeQL for GitHub Actions

[martincostello]

Add GitHub Actions to the CodeQL analysis.

[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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.35%. Comparing base (f58fcfb) to head (30fc501).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2498   +/-   ##
=======================================
  Coverage   85.35%   85.35%           
=======================================
  Files         312      312           
  Lines        7465     7465           
  Branches     1121     1121           
=======================================
  Hits         6372     6372           
  Misses        908      908           
  Partials      185      185           

Flag	Coverage Δ
linux	85.35% <ø> (ø)
macos	85.35% <ø> (ø)
windows	85.32% <ø> (ø)

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