[Misc] typo find in sampling_metadata.py

[noooop]

#5639

Forgot to copy

sampling_params = seq_group.sampling_params

Sampling part is too complicated, can anyone refactor it?

[github-actions]

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[DarkLight1337]

Looks reasonable, thanks for fixing!

[youkaichao]

I think lots of sequence group related code can be deleted now, after #9302 . but I don't have bandwidth recently.

[noooop]

I think lots of sequence group related code can be deleted now, after #9302 . but I don't have bandwidth recently.

I am carefully deleting the sequence group step by step in my project. It is really a headache.

[youkaichao]

@noooop can you join vllm slack? we can discuss it to plan how to remove it. the url for vllm slack is https://slack.vllm.ai .