Validate SpanContext in extractTraceContext

Add isValid() check after creating remote SpanContext to prevent
malformed trace contexts from propagating silently.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: torosent

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

@@ -126,6 +126,10 @@ static Context extractTraceContext(@Nullable TraceContext protoCtx) {
         SpanContext remoteContext = SpanContext.createFromRemoteParent(
                 traceId, spanId, TraceFlags.fromByte(flags), traceState);
 
+        if (!remoteContext.isValid()) {
+            return null;
+        }
+
         return Context.current().with(Span.wrap(remoteContext));
     }
 

internal/durabletask-protobuf/PROTO_SOURCE_COMMIT_HASH

@@ -1 +1 @@
-026329c53fe6363985655857b9ca848ec7238bd2
+1caadbd7ecfdf5f2309acbeac28a3e36d16aa156

internal/durabletask-protobuf/protos/orchestrator_service.proto

@@ -822,6 +822,7 @@ message GetWorkItemsRequest {
     int32 maxConcurrentEntityWorkItems = 3;
 
     repeated WorkerCapability capabilities = 10;
+    WorkItemFilters workItemFilters = 11;
 }
 
 enum WorkerCapability {
@@ -844,6 +845,26 @@ enum WorkerCapability {
     WORKER_CAPABILITY_LARGE_PAYLOADS = 3;
 }
 
+message WorkItemFilters {
+    repeated OrchestrationFilter orchestrations = 1;
+    repeated ActivityFilter activities = 2;
+    repeated EntityFilter entities = 3;
+}
+
+message OrchestrationFilter {
+    string name = 1;
+    repeated string versions = 2;
+}
+
+message ActivityFilter {
+    string name = 1;
+    repeated string versions = 2;
+}
+
+message EntityFilter {
+    string name = 1;
+}
+
 message WorkItem {
     oneof request {
         OrchestratorRequest orchestratorRequest = 1;