Bug: A very long-running check (>1h) will be marked as timed out

[jonbannister]

However, when the check completes it will save properly. In the time range from T0+1h to report completion, it appears that the report has completely failed, but it is working fine.

We need to potentially send a heartbeat to ensure that it is not improperly marked as having failed/timed out when it is actually running in the background.