[Test]Add unit test for worker_v1.py (#2547)

### What this PR does / why we need it?
According to issue
#1298 ,this pull
request adds unit test code for platform.py.

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
CI passed with new added/existing test.

- vLLM version: v0.10.1.1
- vLLM main:
vllm-project/vllm@b5d34af

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Signed-off-by: zhanghaiwen <[email protected]>
Co-authored-by: zhanghaiwen <[email protected]>

Author: zhanghw0354