Skip postcss config location resolving in node_modules (#60697)
## What?
Skip postcss config resolving in node_modules for Turbopack. This
matches current Next.js on webpack closer as that only resolves the
postcss config from the project root. The additional feature Turbopack
has is that it can find a postcss config relative to the css being
compiled. This is useful for e.g. reducing the amount of overhead
certain postcss plugins that only have to run against a single file take
(i.e. Tailwindcss).
Depends on github.com/vercel/turbo/pull/7012 landing first.
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Closes NEXT-2109
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Co-authored-by: Tobias Koppers <tobias.koppers@googlemail.com>
