[stable34] fix(jobs): don't overwrite the --stop_after baseline in background-job:worker - #63328

…b:worker

$startTime was used for two different things:
as baseline for --stop_after and as start time of the currently running job. 
The variable was reassigned during each loop with each new job in the queue, so the baseline for --stop_after was lost and the worker never terminated.

Renaming the job variable fixes this issue.

Assisted-by: Claude:claude-opus-5

Signed-off-by: Sven Hansen <vaenda@vaenda.de>