### What this PR does / why we need it?
This PR add w4a8 accuracy testcase for e2e test
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
By running the test
- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c
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Signed-off-by: cuikai (C) <c00827167@china.huawei.com>
Co-authored-by: cuikai (C) <c00827167@china.huawei.com>