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Lock TestJobs before scheduling to prevent race conditions with TestJob cancelling

Igor Ponomarev requested to merge scheduler-lock-testjobs-collabora-staging into collabora/staging

Use select_for_update() and a transaction to prevent anyone from cancelling or failing jobs while the scheduler tries to schedule them.

Otherwise it is possible for a job to be cancelled while it is being scheduled. This can result in a Device getting stuck in the Reserved state which can only be removed with direct database manipulation.

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