[test] Unflake `use-node-streams-env-precedence` test (#91733)
CI is slow sometimes
([x-ref](https://github.com/vercel/next.js/actions/runs/23353631446/job/67939293839)),
so we're removing the low custom test timeout to allow more time to
build the test fixture.
We're also moving the test from `test/e2e` to `test/production` since
it's only testing the build output, and doesn't need to be run in dev
and deploy modes.
