Added AllVars fix for CMIP6's ICON-ESM-LR

[schlunma]

Description

The CMIP6 model ICON-ESM-LR has wrong var_names for latitude and longitude. This PR adds a fix for this.

Note: This is not related to the ICON native model CMORizer!

Checklist

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[codecov]

Codecov Report

Merging #1582 (4e6afef) into main (8af46d4) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1582   +/-   ##
=======================================
  Coverage   90.81%   90.82%           
=======================================
  Files         199      200    +1     
  Lines       10628    10637    +9     
=======================================
+ Hits         9652     9661    +9     
  Misses        976      976           

Impacted Files	Coverage Δ
esmvalcore/cmor/_fixes/cmip6/icon_esm_lr.py	100.00% <100.00%> (ø)

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[valeriupredoi]

looking good, cheers, Manu! 🍺

[schlunma]

Thanks! 🚀