Retry swept jobs

[romain-priour-lc]

Currently, if a job is swept, there is no mechanism to retry it. This PR adds a "retryable" field, which the sweeper then uses to retry jobs instead of aborting them if they are stuck.

This enables jobs to be retried even if the worker goes OOM.

1. Worker goes OOM, and job is stuck
2. Sweeper from another worker eventually picks up the stuck job, and sets it to retry
3. The job is eventually picked up from the queue at a later point in time.

Before these changes, the stuck job was swept, and immediately aborted.

[QuentinBrosse]

FTR: INF-1032

[QuentinBrosse]

Thanks for that!