add stage level to compute actor span to clarify it's purpose (#8467)

Author: gridnevvvit

ydb/library/yql/dq/actors/compute/dq_compute_actor_impl.h

@@ -189,6 +189,12 @@ class TDqComputeActorBase : public NActors::TActorBootstrapped<TDerived>
                     true,
                     false
         );
+
+        if (ComputeActorSpan) {
+            ComputeActorSpan.Attribute("stageLevel", static_cast<int>(Task.GetProgram().GetSettings().GetStageLevel()));
+            ComputeActorSpan.Attribute("stageId", static_cast<int>(Task.GetStageId()));
+        }
+
         Alloc->SetGUCSettings(GUCSettings);
         InitMonCounters(taskCounters);
         if (ownMemoryQuota) {