Add Mistral Large 3 basic test to PR CI (#14460)

.github/workflows/pr-test.yml

@@ -1203,6 +1203,32 @@ jobs:
           cd test/srt
           python3 run_suite.py --suite per-commit-4-gpu-gb200 --auto-partition-id 0 --auto-partition-size 1 --timeout-per-file 3600
 
+  unit-test-backend-8-gpu-b200:
+    needs: [check-changes, call-gate, unit-test-backend-2-gpu]
+    if: |
+      (inputs.target_stage == 'unit-test-backend-8-gpu-b200') ||
+      (
+        always() &&
+        (github.event_name == 'schedule' || (!failure() && !cancelled())) &&
+        ((needs.check-changes.outputs.main_package == 'true') || (needs.check-changes.outputs.sgl_kernel == 'true'))
+      )
+    runs-on: 8-gpu-b200
+    env:
+      RUNNER_LABELS: 8-gpu-b200
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          IS_BLACKWELL=1 bash scripts/ci/ci_install_dependency.sh
+
+      - name: Run test
+        timeout-minutes: 45
+        run: |
+          cd test/srt
+          python3 run_suite.py --suite per-commit-8-gpu-b200 --timeout-per-file 1800
+
   pr-test-finish:
     needs:
       [
@@ -1235,6 +1261,7 @@ jobs:
         unit-test-deepep-8-gpu,
         unit-test-backend-4-gpu-b200,
         unit-test-backend-4-gpu-gb200,
+        unit-test-backend-8-gpu-b200,
       ]
     if: always()
     runs-on: ubuntu-latest