Migrate locale redirect handling to router-server (#62606)
This moves the locale redirect handling out of `base-server` as it
shouldn't be handled here and should be at the routing level. This
avoids the duplicate handling with middleware that causes the incorrect
detection/infinite looping. Test case from separate PR was carried over
to prevent regression.
Fixes: https://github.com/vercel/next.js/issues/55648
Closes: https://github.com/vercel/next.js/pull/62435
Closes: NEXT-2627
Closes: NEXT-2628
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Co-authored-by: Nourman Hajar <nourmanhajar@gmail.com>
Co-authored-by: samcx <sam@vercel.com>
