fix: hallucination detection tests

[jakelorocco]

Our hallucination detection tests in test_rag.py are failing. I believe this is because the checks in those tests have fallen out of sync with those in the formatter tests. We should fix them. This might also require loosening the expectations for the output like we've done with citations.

example failure:

    -   result = rag.flag_hallucinated_content(None, docs, context, backend)
                for r, e in zip(result, expected, strict=True):  # type: ignore
        >           assert r == e
        E           assert {'explanation...end': 31, ...} == {'explanation...end': 31, ...}
        E
        E             Omitting 4 identical items, use -vv to show
        E             Differing items:
        E             {'explanation': "This sentence makes a factual claim about the color of purple bumble fish. The provided context states: 'The only type
        of fish that is yellow is the purple bumble fish.' This directly supports the claim in the sentence."} != {'explanation': "This sentence makes a factu
        al claim about the color of purple bumble fish. The document states 'The only type of fish that is yellow is the purple bumble fish.' This directly su
        pports the claim in the sentence."}
        E             Use -v to get more diff

        test/stdlib/components/intrinsic/test_rag.py:266: AssertionError

[jakelorocco]

It looks like there's been drift in the expected output:
expected:

{'response_begin': 31, 'response_end': 65, 'response_text': 'Green bumble fish are also yellow.', 'faithfulness': 'unfaithful', 'explanation': 'This sentence makes a factual claim about the color of green bumble fish. However, the document does not mention green bumble fish at all. Therefore, this claim cannot be verified from the provided context.'}

result:

{'response_begin': 31, 'response_end': 65, 'response_text': 'Green bumble fish are also yellow.', 'faithfulness': 'unfaithful', 'explanation': 'This sentence makes a factual claim about the color of green bumble fish. However, the document does not mention green bumble fish, so the claim cannot be verified based on the provided context.'}