Add fix for CMIP6 CNRM-ESM2-1 (variable o3)

[axel-lauer]

Description

Add fix for CMIP6 model CNRM-ESM2-1 to allow handling of vertical hybrid coordiantes for variable o3 (ozone mixing ratio).

This fix is needed to process the CMIP6 example data for the REF ozone diagnostics.

Checklist

It is the responsibility of the author to make sure the pull request is ready to review. The icons indicate whether the item will be subject to the 🛠 Technical or 🧪 Scientific review.

• 🧪 The new functionality is relevant and scientifically sound
• 🛠 This pull request has a descriptive title and labels
• 🛠 Code is written according to the code quality guidelines
• 🧪 and 🛠 Documentation is available
• 🛠 Unit tests have been added
• 🛠 Changes are backward compatible
• 🛠 Any changed dependencies have been added or removed correctly
• 🛠 The list of authors is up to date
• 🛠 All checks below this pull request were successful

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.58%. Comparing base (4262409) to head (76e847f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2920   +/-   ##
=======================================
  Coverage   95.57%   95.58%           
=======================================
  Files         266      266           
  Lines       15520    15530   +10     
=======================================
+ Hits        14834    14844   +10     
  Misses        686      686           

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[valeriupredoi]

thanks @axel-lauer - had a look at it last week, all looks fine to me, was just waiting for you to make the PR RfR, so I can approve 🍻