Change role to user for user prompts

[vladoovtcharov]

User prompts are currently being set to the "system" role instead of "user"

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchchat/1447

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❌ 1 New Failure, 1 Cancelled Job, 1 Unrelated Failure

As of commit 45b34dd with merge base 019f76f ():

NEW FAILURE - The following job has failed:

• Run the aoti runner with CUDA using stories / test-runner-aot-cuda / linux-job (gh)
  RuntimeError: Command docker exec -t bf90f81a1aae356a0574ecd7f0ea47b954a862a4df5325ffbb6518afdfe6c26c /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / runner-aoti (macos-14-xlarge) (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / runner-aoti (16-core-ubuntu) (gh) (trunk failure)
  Process completed with exit code 1.

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