Avoid copying input data in CMIP6 CESM2 air pressure level fixes

[bouweandela]

Description

Use ncdata to fix files in-memory instead of copies on disk.

Related to #2129 and #674

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[valeriupredoi]

very cool @bouweandela 👏 Always nice to see data transfer optimizations, hope you don't mind me turning on the GA see if any issues for older Pythons - I took a look at the failed tests - couple of them due to mocks not called (easy fix) but one fails due to what looks to be a reversal of the lev bounds, can prob fix that for you here, if you don't have time 🍺

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.78%. Comparing base (e9fccbd) to head (b95ee63).
⚠️ Report is 254 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2454   +/-   ##
=======================================
  Coverage   94.77%   94.78%           
=======================================
  Files         251      251           
  Lines       14266    14292   +26     
=======================================
+ Hits        13520    13546   +26     
  Misses        746      746           

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[bouweandela]

TODO: move to new fix preprocessor function instead of changing fix_file?

What about chunking?

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