[Service Bus] Link messageSpanContexts while sending - for array of messages (Azure#12508)

For sending the array of messages case, we weren't linking the message span contexts while creating the send span.
This PR attempts to fix that!

Author: HarshaNalluru

sdk/servicebus/service-bus/src/sender.ts

@@ -26,7 +26,7 @@ import {
   getParentSpan,
   OperationOptionsBase
 } from "./modelsToBeSharedWithEventHubs";
-import { CanonicalCode, SpanContext } from "@opentelemetry/api";
+import { CanonicalCode } from "@opentelemetry/api";
 import { senderLogger as logger } from "./log";
 
 /**
@@ -189,12 +189,8 @@ export class ServiceBusSenderImpl implements ServiceBusSender {
     const invalidTypeErrMsg =
       "Provided value for 'messages' must be of type ServiceBusMessage, ServiceBusMessageBatch or an array of type ServiceBusMessage.";
 
-    // link message span contexts
-    let spanContextsToLink: SpanContext[] = [];
-
     let batch: ServiceBusMessageBatch;
     if (isServiceBusMessageBatch(messages)) {
-      spanContextsToLink = messages._messageSpanContexts;
       batch = messages;
     } else {
       if (!Array.isArray(messages)) {
@@ -216,7 +212,7 @@ export class ServiceBusSenderImpl implements ServiceBusSender {
 
     const sendSpan = createSendSpan(
       getParentSpan(options?.tracingOptions),
-      spanContextsToLink,
+      batch._messageSpanContexts,
       this.entityPath,
       this._context.config.host
     );