Add job statuses to see when a job has finished

[pglass]

Since you can execute a job multiple times, we'll probably need another api call to fetch status for each execution of that job. This could look something like:

GET /v1/{tenant}/jobs/{job_id}/history/{run_number}
{
    “run_number": 1,
    "job_id": "4dcd8e8f-cdd4-4dc1-8f3c-8242db216388",
    "status": "in-progress",
    ...
}

I'm not sure what statuses we'll actually end up using... We'll need at least:

• running or in-progress while the job is running
• error if the job failed to complete for some reason
• complete if the job has finished