Currently, format.sh captures each job's WiredTiger output to a per-job log file, but discards it once the job resolves - in resolve(), both the "successful job" path and the "killed job" path unconditionally rm -rf $dir $log $rec_dir. Failed jobs already keep their log via report_failure(), but successful and timed-out/killed jobs don't and the deleted log is the only record of what that specific job was doing when it got killed.

Additionally, test format only reports to its own stdout when a job finishes, so a single-long running job is indistinguishable from a hang, and long-running jobs (>= 2 hrs) are killed when nothing is printed to stdout/stderr.

Fix: retain the job's log, CONFIG, and WiredTigerStat.* files, and add live logging from WT to stdout/stderr.