[ci] Migrate some CI jobs back to x86-64, build both arm and x86-64 native binaries, include both os and architecture in native artifact names (#95341)
This should be a more robust version of
https://github.com/vercel/next.js/pull/95332 that re-introduces some
x86-64 runners, but also properly segments the artifact cache.
Even if we don't end up merging this, this does some cleanup of
`uploadNativeArtifact` that might be useful to pull out into a separate
PR.