message: [cluster-test] enable twin test
  Closes:
diff: @@ -53,10 +53,7 @@ impl ExperimentSuite {
  .enable_db_backup()
  .build(cluster),
  ));
  - if env::var("TWIN_EXPERIMENT").is_ok() {
  experiments.push(Box::new(TwinValidatorsParams { pair: 1 }.build(cluster)));
  - }
  -
  experiments.push(Box::new(
  CpuFlamegraphParams { duration_secs: 60 }.build(cluster),
  ));
  