[TEST]Add 2P1D multi node cases for nightly test (#3764)

### What this PR does / why we need it?
This PR adds the 2P1D multi node func/acc/perf test cases, we need test
them daily
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
by running the test

- vLLM version: v0.11.0rc3
- vLLM main:
c9461e05a4

---------

Signed-off-by: jiangyunfan1 <jiangyunfan1@h-partners.com>
Signed-off-by: wangli <wangli858794774@gmail.com>
Co-authored-by: wangli <wangli858794774@gmail.com>

tools/aisbench.py

@@ -231,6 +231,8 @@ class AisbenchRunner:
 
 
 def run_aisbench_cases(model, port, aisbench_cases):
+    if isinstance(aisbench_cases, dict):
+        aisbench_cases = [aisbench_cases]
     aisbench_results = []
     aisbench_errors = []
     for aisbench_case in aisbench_cases: