void pollJob() {
    jobPollingService.startAsync();
    jobPollingService.awaitTerminated();
  }
Polls a {@code PortabilityJob} for this transfer worker to process.

<p>

<p>Lightweight wrapper around an {@code AbstractScheduledService} so as to not expose its
implementation details.
portability-transfer/src/main/java/org/datatransferproject/transfer/JobPoller.java