[Benchmark] Refactor perf script to use benchmark cli (#1524)

### What this PR does / why we need it?

Since, `vllm bench` cli has optimized enough for production use(support
more datasets), we are now do not need to copy vllm codes, now , with
vllm installed, we can easily use the benchmark cli
### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
CI passed

---------

Signed-off-by: wangli <wangli858794774@gmail.com>

.github/workflows/nightly_benchmarks.yaml

@@ -115,6 +115,7 @@ jobs:
         env:
           PIP_EXTRA_INDEX_URL: https://mirrors.huaweicloud.com/ascend/repos/pypi
         run: |
+          pip install "transformers<=4.52.4"
           pip install -e .
           pip install -r benchmarks/requirements-bench.txt