Add automated restart test infrastructure (#17491)

multinode-demo/bootstrap-validator.sh

@@ -75,6 +75,9 @@ while [[ -n $1 ]]; do
     elif [[ $1 == --maximum-snapshots-to-retain ]]; then
       args+=("$1" "$2")
       shift 2
+    elif [[ $1 == --no-snapshot-fetch ]]; then
+      args+=("$1")
+      shift
     else
       echo "Unknown argument: $1"
       $program --help