[Workbench] [Fiddlesticks] Live job log should show recent history
Jobs can get in this state if the arv-put process that crunch-job ran to create the log fails. See, e.g., qr1hi-8i9sb-yuch10zftex4cip.
This happens because _show_log.html.erb has a couple of expressions like
logcollection.files. In this case,
Functional requirements: Workbench should check when a job's log field is nil or the empty collection. In either of those cases, it should fetch logs from the log table and render those, along with a warning that the logs might be incomplete because of throttling.
Implementation: When you go to the live log tab on a pipeline, it gets the last 1000-2000 lines of history. However, the live log tab for an individual job does not show any history. The job log should behave similarly to the pipeline instance.