remove outdated AeronetV2 datasets

[jgriesfeller]

Change Summary

the title says it all

Related issue number

fix #1106

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.27%. Comparing base (cadc4ab) to head (51541ed).
Report is 1 commits behind head on main-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1132      +/-   ##
============================================
+ Coverage     79.25%   79.27%   +0.01%     
============================================
  Files           110      110              
  Lines         19103    19095       -8     
============================================
- Hits          15140    15137       -3     
+ Misses         3963     3958       -5     

Flag	Coverage Δ
unittests	79.27% <ø> (+0.01%)	⬆️

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[lewisblake]

LGTM