message: Restore call's final stats collection in PC level framework
  Cr-Commit-Position: refs/heads/master@{#31040}
diff: @@ -317,6 +317,15 @@ void PeerConnectionE2EQualityTest::Run(RunParams run_params) {
  // Stop all client started tasks to prevent their access to any call related
  // objects after these objects will be destroyed during call tear down.
  executor_->Stop();
  + // There is no guarantee, that last stats collection will happen at the end
  + // of the call, so we force it after executor, which is among others is doing
  + // stats collection, was stopped.
  + task_queue_->SendTask(
  + [&stats_poller]() {
  + // Get final end-of-call stats.
  + stats_poller.PollStatsAndNotifyObservers();
  + },
  + RTC_FROM_HERE);
  // We need to detach AEC dumping from peers, because dump uses |task_queue_|
  // inside.
  alice_->DetachAecDump();
  