fix race conditions in git progress pool#225
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Fix intermittent git progress pool crashes
Adds
useMallocby default for cleaner sanitizer runs, and serializes subprocess start/close ingitprogresspoolto avoid intermittentBad file descriptorfailures seen under concurrent worker load on macOS.Also converts worker exceptions into failed job results so the pool does not hang if process setup or output reading fails.
Tested:
nim c -r tests/tgitprogresspool.nim