Only run CodeQL on src code

[somewhatabstract]

Issue: XXX-XXXX

Test plan:

Let's see what happens...

[codecov]

Codecov Report

Merging #668 (0c17bf5) into main (3f9532d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #668   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files          30       30           
  Lines         549      549           
  Branches      108      108           
=======================================
  Hits          548      548           
  Misses          1        1           

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