Fix Azure Blob payload externalization for continue-as-new carryover

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Externalize continue-as-new carryover event payloads using the configured UTF-8 size limits, preventing oversized completion responses ([#819](https://github.com/microsoft/durabletask-dotnet/issues/819)).
 
 ## v1.27.1
 - Propagate tags from entity-started orchestrations ([#812](https://github.com/microsoft/durabletask-dotnet/pull/812))

src/Extensions/AzureBlobPayloads/Interceptors/AzureBlobPayloadsSideCarInterceptor.cs

@@ -365,6 +365,11 @@ async Task ExternalizeOrchestratorResponseAsync(P.OrchestratorResponse r, Cancel
                         }
                     });
                 }
+
+                foreach (P.HistoryEvent historyEvent in complete.CarryoverEvents)
+                {
+                    operations.Add(() => this.ExternalizeHistoryEventAsync(historyEvent, cancellation));
+                }
             }
 
             if (a.TerminateOrchestration is { } term)