message: Return early from PR functions if not enabled.
  Summary: As in title. These actually show up in profiles.
diff: @@ -1029,11 +1029,11 @@ QuicTransportBase::setDataExpiredCallback(
  }
  void QuicTransportBase::invokeDataExpiredCallbacks() {
  - auto self = sharedGuard();
  - if (closeState_ != CloseState::OPEN) {
  + if (!conn_->partialReliabilityEnabled || closeState_ != CloseState::OPEN) {
  return;
  }
  + auto self = sharedGuard();
  for (auto streamId : self->conn_->streamManager->dataExpiredStreams()) {
  auto callbackData = self->dataExpiredCallbacks_.find(streamId);
  // Data expired is edge-triggered (nag only once on arrival), unlike read
  @@ -1120,11 +1120,11 @@ QuicTransportBase::setDataRejectedCallback(
  }
  void QuicTransportBase::invokeDataRejectedCallbacks() {
  - auto self = sharedGuard();
  - if (closeState_ != CloseState::OPEN) {
  + if (!conn_->partialReliabilityEnabled || closeState_ != CloseState::OPEN) {
  return;
  }
  + auto self = sharedGuard();
  for (auto streamId : self->conn_->streamManager->dataRejectedStreams()) {
  auto callbackData = self->dataRejectedCallbacks_.find(streamId);
  // Data rejected is edge-triggered (nag only once on arrival), unlike read
  