### What & Why
Fixes NEXT-3498
Fixed loading shows up and disappear during client navigation, when you
defined `prefetch` is enabled and slow `generateMetadata` is defined. In
#64532, where in layout-router, we removed the place of infinite
suspense, adding it back so that the app can still remain suspensy
during navigation.
#### Behavior before fix
Prefetch -> Link Navigation -> Show `loading.js` -> RSC payload fetched
(no page content) -> the page content will display later when the
promise is resolved
#### Behavior after the fix
Prefetch -> Link Navigation -> Show `loading.js` -> RSC payload fetched
-> suspensy page content still triggering `loading.js` -> display the
resolved page content when the promise is resolved
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Co-authored-by: Zack Tanner <1939140+ztanner@users.noreply.github.com>
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