github workflows: sumer update runtime upgrade CI to start from babylon

.github/workflows/run-network-tests.yml

@@ -100,7 +100,7 @@ jobs:
       - name: Ensure tests are runnable
         run: yarn workspace network-tests build
       - name: Execute network tests
-        run: RUNTIME=alexandria tests/network-tests/run-tests.sh full
+        run: RUNTIME=babylon tests/network-tests/run-tests.sh full
 
   basic_runtime:
     name: Integration Tests (New Chain)