Set request Id on SignalWorkflowExecutionRequest (temporalio#2352)

Author: Quinn-With-Two-Ns

temporal-sdk/src/main/java/io/temporal/internal/client/RootWorkflowClientInvoker.java

@@ -125,6 +125,7 @@ public WorkflowSignalOutput signal(WorkflowSignalInput input) {
             .setWorkflowExecution(input.getWorkflowExecution())
             .setIdentity(clientOptions.getIdentity())
             .setNamespace(clientOptions.getNamespace())
+            .setRequestId(UUID.randomUUID().toString())
             .setHeader(HeaderUtils.toHeaderGrpc(input.getHeader(), null));
 
     DataConverter dataConverterWitSignalContext =