Cleanup build processes on timeout

On timeout, bild would leave it's child processes still running, which means
that a long build would continue to go in the background, and I'd have to
manually find and kill it. The fix was simply to use Conduit's
`closeStreamingProcessHandle` function, and make sure that Conduit created a
group for the processes (by default it doesn't).

I tested this by building and running `bild` with a very low timeout (1 minute)
and watching `gotop` to make sure it stopped the active build process. I
couldn't figure out a simple way to test this automatically.

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