Respect ignore_warnings settings in Dataset.load

[schlunma]

Description

This PR fixes an issue where ignored warnings defined in the config-developer.yml file are ignored by Dataset.load.

Closes #2045

Link to documentation: https://esmvaltool--2046.org.readthedocs.build/projects/ESMValCore/en/2046/api/esmvalcore.dataset.html#esmvalcore.dataset.Dataset.load

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• 🧪 The new functionality is relevant and scientifically sound
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[codecov]

Codecov Report

Merging #2046 (590b3fa) into main (153c3a8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2046   +/-   ##
=======================================
  Coverage   92.90%   92.90%           
=======================================
  Files         234      234           
  Lines       12496    12501    +5     
=======================================
+ Hits        11609    11614    +5     
  Misses        887      887           

Impacted Files	Coverage Δ
esmvalcore/_recipe/recipe.py	99.01% <ø> (-0.02%)	⬇️
esmvalcore/config/_config.py	98.91% <100.00%> (+0.14%)	⬆️
esmvalcore/dataset.py	100.00% <100.00%> (ø)
esmvalcore/preprocessor/_supplementary_vars.py	98.05% <100.00%> (+0.03%)	⬆️

[bouweandela]

Thanks for looking into this issue @schlunma!