Delete committed dataset orphans (Track X)

These files are committed but read by nothing in this repository: every lecture that uses these datasets reads them from QuantEcon/data-lectures (verified per file on 2026-09-01), and the remaining files are written by the lectures themselves with %%file / %%writefile before being read. Translations sit outside the data-lectures audit's scanned set, so this is the translation half of the orphan sweep tracked at QuantEcon/workspace-lectures#57. An authenticated content sweep of 407 repositories (283 QuantEcon org repos plus the forks of the holding repos, by basename, positive and negative controls in the same pass) on 2026-09-01 found no reader of these paths.

Unlike the English repo, this translation's exercise prose links to the English repo's python_advanced_features/test_table.csv URL, so both local test_table.csv copies are orphans here. test_pwt.csv is the copy left behind by the Track D repoint (QuantEcon/workspace-lectures#54).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: mmcky