Clean the downloads directory every CI run. #19311
Merged
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Now that vcpkg has artifact caching, meaning downloading artifacts usually doesn't have to leave the datacenter, there's no need to potentially dirty different runs with leftover downloads from each other.
This resulted in some "impossible" results in #18687 where a previous PR run accidentally downloaded the Windows version of nodejs to /mnt/vcpkg-ci/downloads/node-v14.17.4-linux-x64.tar.xz