remove datasets.yaml

[SiQube]

somehow I missed that _add_shipped_datasets relies on datasets.yaml which is kind of annoying because you're not able to add a dataset without tests failing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (21d539f) to head (9a6fa6d).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1053   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           80        80           
  Lines         3602      3602           
  Branches       646       647    +1     
=========================================
  Hits          3602      3602           

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