Fixes #443

When an agent gets disconnected (AWS interruption) the job is set to aborted.
Currently the job that gets resubmitted is the last failed job, which is not the job that was running on the agent that got disconnected, leading to the wrong parameters being used with the resubmitted job.

This fixes the issue by using getLastUnsuccessfulBuild to get the last job that ran before the agent went down.

Testing done

Unit testing with mvn test and locally

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