message: Fix stress test race condition
  ## Description
  As the op is produced in the next batch, the container might have time
  to close in the meantime.
diff: @@ -226,8 +226,10 @@ export class LoadTestDataStoreModel {
  const changed = (taskId) => {
  if (taskId === this.taskId && this.taskStartTime !== 0) {
  Promise.resolve().then(() => {
  + if (!this.runtime.disposed) {
  this.dir.set(taskTimeKey, this.totalTaskTime);
  this.taskStartTime = 0;
  + }
  }).catch((error) => {
  this.logger.sendErrorEvent({
  eventName: "TaskManager_OnValueChanged",
  @@ -263,7 +265,9 @@ export class LoadTestDataStoreModel {
  if (newBlobs > 0) {
  Promise.resolve().then(() => {
  + if (!this.runtime.disposed) {
  this.blobUploads.push(...[...Array(newBlobs)].map(async () => this.writeBlob(this.blobCount++)));
  + }
  }).catch((error) => this.logger.sendErrorEvent({
  eventName: "WriteBlobFailed_OnCounterValueChanged",
  count: this.blobCount,
  