Do not rely on remote dataset fetching for CI to complete

[charavelg]

Skip related doctest if datasets cannot be cached and use local data for doc generation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.91%. Comparing base (8462db1) to head (baded8b).
⚠️ Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #563      +/-   ##
==========================================
+ Coverage   88.46%   88.91%   +0.44%     
==========================================
  Files          67       67              
  Lines        5782     5782              
==========================================
+ Hits         5115     5141      +26     
+ Misses        667      641      -26     

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