add conco3mda8 to fairmode stats

[charlienegri]

Change Summary

conco3mda is the variable that should be used for fairmode stats, we leave conco3 there for now but in principle it can be removed at some point

Related issue number

trying to close #1327

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[charlienegri]

testing this with an experiment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.96%. Comparing base (9e48af9) to head (56401dd).
Report is 14 commits behind head on main-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1328      +/-   ##
============================================
- Coverage     78.97%   78.96%   -0.01%     
============================================
  Files           136      136              
  Lines         20812    20813       +1     
============================================
  Hits          16436    16436              
- Misses         4376     4377       +1     

Flag	Coverage Δ
unittests	78.96% <ø> (-0.01%)	⬇️

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[charlienegri]

tested now and it seems to work https://aeroval-test.met.no/charlien/pages/overall/?project=cams2-83&experiment=test-forecast-week-conco3mda8&station=ALL&tab=target&parameter=conco3mda8&frequency=daily#