[CI]Unblock and split spec v2+dp test (#14551)

.github/workflows/pr-test.yml

@@ -1143,7 +1143,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        part: [0, 1]
+        part: [0, 1, 2]
 
     steps:
       - name: Checkout code
@@ -1165,7 +1165,7 @@ jobs:
         timeout-minutes: 30
         run: |
           cd test/srt
-          python3 run_suite.py --suite per-commit-4-gpu-b200 --auto-partition-id ${{ matrix.part }}  --auto-partition-size 2 --timeout-per-file 1800
+          python3 run_suite.py --suite per-commit-4-gpu-b200 --auto-partition-id ${{ matrix.part }}  --auto-partition-size 3 --timeout-per-file 1800
 
   unit-test-backend-4-gpu-gb200:
     needs: [check-changes, call-gate, unit-test-backend-2-gpu, sgl-kernel-build-wheels-arm]