dont request prompt logprobs as we dont use them and they disable prefix cache and burst vllm memory usage

[Jackmin801]

Note

Removes unused prompt logprobs requests to improve vLLM behavior and aligns documentation.

• In RLConfig.sampling_args.extra_body and token_utils.prepare_sampling_args_for_token_prompts(), remove prompt_logprobs while keeping return_token_ids/return_tokens_as_token_ids and logprobs enabled
• Update docs/release/TRAJECTORIES.md to no longer recommend prompt_logprobs in sampling_args

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