fixes and improvements for the WebNLG loader
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The dataset card is fantastic!

Looks good to me! Did you check that this still passes the slow tests with the existing dummy data? Yes, I ran and passed all the tests specified in [this guide](https://github.com/huggingface/datasets/blob/master/ADD_NEW_DATASET.md#automatically-add-code-metadata), including the slow ones. I just added the `from pathlib import Path` at the top to fix the script I ran the tests locally and they all pass, merging Thank you for the review!
- fixes test sets loading in v3.0
- adds additional fields for v3.0_ru
- adds info to the WebNLG data card
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