[CI] add weekly case (#9380)
### What this PR does / why we need it?
We run the weekly test case at a fixed period. add weekly case
### Does this PR introduce _any_ user-facing change?
no
### How was this patch tested?
by running the test
- vLLM version: v0.20.2
- vLLM main:
https://github.com/vllm-project/vllm/commit/0d4d334eaa583b9c09aa4eb7538c22db99fd84b3
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Signed-off-by: chen-commits <1636718796@qq.com>
Signed-off-by: chen <1636718796@qq.com>