### What this PR does / why we need it? This PR adds the initial prefix cache case for nightly test for Qwen3-32b-int8 on A3, we need test them daily. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? By running the test - vLLM version: v0.11.0rc3 - vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0 Signed-off-by: jiangyunfan1 <jiangyunfan1@h-partners.com>