68731c07c5
In profiling integration tests, I found a couple places where per-test overhead could be reduced: * Avoiding disk IO by synchronizing instead of deleting & copying test Git repository data. This saves ~100ms per test on my machine * When flushing queues in `PrintCurrentTest`, invoke `FlushWithContext` in a parallel. --------- Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>