Werk #15602: mk-job: Cleanup after execution was interrupted

Previously, if the wrapper program mk-job was interrupted by a reboot, the Job service would continue to show the job, which was started by mk-job. This job was shown to be running despite it being terminated by the reboot. This can be fixed by removing the corresponding file created by mk-job. With this werk, mk-job cleans up the file after being interrupted. Thus, these terminated jobs will no longer be shown as running.

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