message: op-node: fix l2_safe missing metrics line
diff: @@ -303,6 +303,7 @@ func (eq *EngineQueue) consolidateNextSafeAttributes(ctx context.Context) error
  return NewResetError(fmt.Errorf("failed to decode L2 block ref from payload: %v", err))
  }
  eq.safeHead = ref
  + eq.metrics.RecordL2Ref("l2_safe", ref)
  // unsafe head stays the same, we did not reorg the chain.
  eq.safeAttributes = eq.safeAttributes[1:]
  eq.postProcessSafeL2()
  