[llm_judge] key mismatch during match list deduplication when mode=pairwise-baseline

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Hi, I'm getting an error during the deduplication of the matches.

> Traceback (most recent call last):
File ".../gen_judgment.py", line 302, in
[
File ".../gen_judgment.py", line 303, in
f"{e['question_id']}{e['model']}{e['judge'][0]}{e['judge'][1]}{e['turn']}"
KeyError: 'model'

It works fine when mode=single but for mode=pairwise-baseline, it has a different set of keys, which leads to a mismatch.

For mode=single:
> dict_keys(['question_id', 'model', 'judge', 'user_prompt', 'judgment', 'score', 'turn', 'tstamp'])

For mode=pairwise-baseline:
> dict_keys(['question_id', 'model_1', 'model_2', 'g1_winner', 'g2_winner', 'judge', 'g1_user_prompt', 'g1_judgment', 'g2_user_prompt', 'g2_judgment', 'turn', 'tstamp'])

Here is a command I used
```
python gen_judgment.py \
--mode pairwise-baseline \
--baseline-model vicuna-7b-v1.3 \
--model-list mpt-7b-chat \
--parallel 2
```

Any pointer would be appreciated!

Start in gen_judgment.py around lines 302-303 and compare the deduplication key used for mode=single with the keys produced by mode=pairwise-baseline. Reproduce the issue with the command in the report. Done means pairwise-baseline no longer raises KeyError during match-list deduplication while single mode continues to work.

Written by the indexing model from the issue text.