### What this PR does / why we need it?
- For npu environment, we should use `PYTORCH_NPU_ALLOC_CONF ` rather
than `PYTORCH_CUDA_ALLOC_CONF`
- Add `PIP_EXTRA_INDEX_URL` to make nightly_benchmarks happy
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Signed-off-by: wangli <wangli858794774@gmail.com>