[Siddhant Rajhans (siddhant-rajhans)]

Description

Fixes #4230. FuzzerGenerator counted a jailbreak for every passing score. A scorer that returns several scores per response, such as AzureContentFilterScorer with one per harm category, made one jailbroken response count several times, listed its conversation several times in jailbreak_conversation_ids, and could stop at target_jailbreak_goal_count before that many responses were jailbroken.

• _process_scoring_results counts a response once when any of its scores passes and records its conversation once. Attribution by the scored piece id (FIX: attribute fuzzer jailbreak scores through the scored piece id #3300) is unchanged.
• The MCTS reward is now jailbroken responses over responses. FIX: bound the Fuzzer MCTS reward by the scored query count #3628 kept it in [0, 1] by dividing by the number of scores; with each response counted once, dividing by the number of responses keeps the same bound and makes the reward the template's jailbreak rate, as in GPTFuzzer's MCTS-Explore (succ_num / (len(questions) * len(prompt_nodes)), one verdict per response).
• Regression tests: a response with several passing scores, both in _process_scoring_results and through execute_async, and the reward for two scores per response.

The repro from #4230 (goal of 2 jailbreaks, two of four categories above the threshold):

• main: queries: 1, jailbreak conversations: 2 (1 distinct)
• this PR: queries: 2, jailbreak conversations: 2 (2 distinct)

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