docs(eval): point four validators at the new dataset Drive folder

[PritamSGB]

Summary

Datasets for PII remover, content safety (toxicity), gender assumption bias and scope control (topic relevance) have moved to a new Drive folder. The README now lists both sources instead of one:

• Current datasets — the four validators above
• Earlier datasets — ban list and multiple validators

The new folder names its subfolders by product area (Privacy protection, Content Safety, Gender neutrality, Scope Control) rather than by validator, so the README carries a small mapping table rather than leaving readers to guess. The per-validator filename table below it is unchanged and stays link-free.

Notes for reviewers

• Docs only — no code touched, nothing to run.
• Related but independent of feat(eval): add validator config and combined metrics to eval outputs #159 / feat(eval): add --backend flag and cross-domain combined metrics to topic relevance eval #160 / feat(eval): add lexical_slur to toxicity eval, standardize dataset #161; this can merge on its own.
• Best merged after feat(eval): add lexical_slur to toxicity eval, standardize dataset #161, which removes the standalone lexical slur eval. This PR already drops lexical slur from the earlier-datasets line on that assumption, so merging this first leaves a short window where that (unused) script has no documented dataset source.

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