Avoid issue with deepcopying/pickling IntakeESGFDatasets

[bouweandela]

Description

Closes #2989

Link to documentation:

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.69%. Comparing base (3208f5f) to head (2216c23).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2990   +/-   ##
=======================================
  Coverage   95.68%   95.69%           
=======================================
  Files         267      267           
  Lines       15726    15733    +7     
=======================================
+ Hits        15048    15055    +7     
  Misses        678      678           

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