FEAT Add OR-Bench dataset loader

[romanlutz]

Add remote dataset loader for OR-Bench (bench-llm/OR-Bench), an over-refusal benchmark that tests whether language models wrongly refuse safe prompts. Supports both or-bench-hard-1k and or-bench-toxic configurations.

[Copilot]

Pull request overview

Adds a new remote dataset loader for the HuggingFace OR-Bench benchmark (bench-llm/OR-Bench) so it can be discovered via SeedDatasetProvider and loaded as SeedDataset seeds, with support for both the or-bench-hard-1k and or-bench-toxic configurations.

Changes:

• Introduces _ORBenchDataset remote loader that fetches OR-Bench from HuggingFace and converts rows into SeedPrompts.
• Registers the new loader for automatic discovery and documents the new dataset name in the datasets loading notebook output.
• Adds unit tests covering default loading and the toxic config path.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
pyrit/datasets/seed_datasets/remote/or_bench_dataset.py	Implements the OR-Bench HuggingFace-backed dataset loader and maps records into SeedPrompts.
pyrit/datasets/seed_datasets/remote/__init__.py	Imports/exports _ORBenchDataset to trigger provider registration and expose it from the remote loaders package.
tests/unit/datasets/test_or_bench_dataset.py	Adds unit tests validating prompt mapping and config propagation to the HuggingFace fetch helper.
doc/code/datasets/1_loading_datasets.ipynb	Updates the displayed list of available datasets to include or_bench.