Add codeql config to mass suppress certain not-applicable rules

[GrabYourPitchforks]

Experimental config.

This should automatically resolve 40 alerts from our reporting portal once the backend changes come online.

Microsoft Reviewers: Open in CodeFlow

[GrabYourPitchforks]

Note to reviewers: I'm still working with the backend services team to finalize the syntax and get the new infra published. Feel free to review / approve this PR at your leisure. I'll mark as "ready" once the backend changes go live.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.25689%. Comparing base (7b4d380) to head (0709110).
⚠️ Report is 595 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #14240         +/-   ##
===================================================
+ Coverage   61.34640%   63.25689%   +1.91048%     
===================================================
  Files           1547        1568         +21     
  Lines         158482      160128       +1646     
  Branches       14752       14957        +205     
===================================================
+ Hits           97223      101292       +4069     
+ Misses         60557       58038       -2519     
- Partials         702         798         +96     

Flag	Coverage Δ
Debug	63.25689% <ø> (-4.91392%)	⬇️
integration	11.39670% <ø> (-4.98724%)	⬇️
production	41.52775% <ø> (-26.64306%)	⬇️
test	95.71711% <ø> (∅)
unit	38.93910% <ø> (-28.45005%)	⬇️

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