Add support for variables phcint and amoc to ICON-XPP CMORizer

[schlunma]

Description

This PR adds support for variables phcint (new derived variable; will be a non-derived variable in CMIP7) and amoc to the ICON-XPP CMORizer.

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Checklist

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• 🧪 The new functionality is relevant and scientifically sound
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• 🛠 Unit tests have been added
• 🛠 Changes are backward compatible
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (653ee9c) to head (f1d1f8d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3025      +/-   ##
==========================================
+ Coverage   95.70%   96.15%   +0.45%     
==========================================
  Files         267      268       +1     
  Lines       15771    15815      +44     
==========================================
+ Hits        15093    15207     +114     
+ Misses        678      608      -70     

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