tests: Reuse dataset definitions in from_csv tests

[dkrako]

Reusing the data from the public DatasetDefinitions should be more robust for future changes.

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (43e6597) 100.00% compared to head (3e6fc5f) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #586 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 52 52 Lines 2283 2283 Branches 568 568 ========================================= Hits 2283 2283 ```

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