[Backport 2.22-maintenance] Increase download buffer size and improve tarball import logging #11213
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(cherry picked from commit caf4e98)
We are piping curl downloads into `unpackTarfileToSink()`, but the latter is typically slower than the former if you're on a fast connection. So the download could appear unnecessarily slow. (There is even a risk that if the Git import is *really* slow for whatever reason, the TCP connection could time out.) So let's make the download buffer bigger by default - 64 MiB is big enough for the Nixpkgs tarball. Perhaps in the future, we could have an unlimited buffer that spills data to disk beyond a certain threshold, but that's probably overkill. (cherry picked from commit 8ffea0a)
(cherry picked from commit f6a9a71)
This happens in parallel with the download (which starts later), so you only see this message when the download has finished but the import hasn't. (cherry picked from commit 01839b5)
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Automatic backport to
2.22-maintenance, triggered by a label in #11171.