Fix coord renaming for AOD product in 'abi_l2_nc' reader

[mraspaud]

This PR fixes the dimension renaming problem from #2215

• Closes Abi l2 nc reader can't handle AOD product #2215
• Tests added

[djhoese]

I think this is an acceptable workaround for now. I think in the long term and maybe for a more generic CF reader, we should figure out some logic to find all the grid mapping variables, from them find all the axis variables, and from them figure out what dimensions we would like to rename for y/x.

[coveralls]

Coverage increased (+0.003%) to 94.742% when pulling b73eb13 on mraspaud:fix-aod-coord-renaming into 7a30eb8 on pytroll:main.

[codecov]

Codecov Report

Merging #2216 (b73eb13) into main (7a30eb8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2216   +/-   ##
=======================================
  Coverage   94.13%   94.14%           
=======================================
  Files         293      293           
  Lines       45079    45101   +22     
=======================================
+ Hits        42437    42459   +22     
  Misses       2642     2642           

Flag	Coverage Δ
behaviourtests	4.68% <0.00%> (-0.01%)	⬇️
unittests	94.79% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
satpy/readers/abi_base.py	94.52% <100.00%> (+0.07%)	⬆️
satpy/tests/reader_tests/test_abi_l2_nc.py	100.00% <100.00%> (ø)

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