Fix exception handling and stale trace context in distributed tracing (#267)

Author: Copilot

client/src/main/java/com/microsoft/durabletask/DurableTaskGrpcWorker.java

@@ -208,7 +208,10 @@ public void startAndBlock() {
                             } catch (Throwable e) {
                                 TracingHelper.endSpan(orchestrationSpan, e);
                                 orchestrationScope.close();
-                                throw e;
+                                if (e instanceof Error) {
+                                    throw (Error) e;
+                                }
+                                throw new RuntimeException(e);
                             }
                             orchestrationScope.close();
                             TracingHelper.endSpan(orchestrationSpan, null);

client/src/main/java/com/microsoft/durabletask/OrchestrationRunner.java

@@ -181,12 +181,12 @@ public TaskOrchestration create() {
             taskOrchestratorResult = taskOrchestrationExecutor.execute(
                     orchestratorRequest.getPastEventsList(),
                     orchestratorRequest.getNewEventsList());
-        } catch (Throwable e) {
+        } catch (Exception e) {
             TracingHelper.endSpan(orchestrationSpan, e);
-            orchestrationScope.close();
             throw e instanceof RuntimeException ? (RuntimeException) e : new RuntimeException(e);
+        } finally {
+            orchestrationScope.close();
         }
-        orchestrationScope.close();
         TracingHelper.endSpan(orchestrationSpan, null);
 
         OrchestratorService.OrchestratorResponse response = OrchestratorService.OrchestratorResponse.newBuilder()

client/src/main/java/com/microsoft/durabletask/TaskOrchestrationExecutor.java

@@ -887,6 +887,8 @@ private void processEvent(HistoryEvent e) {
                         this.setVersion(version);
                         if (startedEvent.hasParentTraceContext()) {
                             this.parentTraceContext = startedEvent.getParentTraceContext();
+                        } else {
+                            this.parentTraceContext = null;
                         }
                         TaskOrchestrationFactory factory = TaskOrchestrationExecutor.this.orchestrationFactories.get(name);
                         if (factory == null) {