### What / why?
Currently there is a bug because the `subTreeData` can only be applied
once, however, we reuse the same response when a url was prefetched.
During the first render of the response we apply the cacheNodes and then
these should be reused for subsequent navigations. There's currently a
bug because `fillLazyItemsTillLeafWithHead` creates `LAZY_INITIALIZED`
cache nodes that don't copy the previous cache node `parallelRoutes` and
`subTreeData` value, causing the cache nodes below where the
`subTreeData` is applied to be deleted from the cache, even when they're
not affected by the navigation.
### How?
This PR adds copying of the cache node when it exists already, I've
added a marker for `wasPrefetched` to trigger that behavior but in
talking to @feedthejim about this it seems we can swap to this behavior
always when applying the server response, that needs to be discussed
further though, this is temporary implementation with the fix for routes
that were prefetched.
Fixes NEXT-402
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Co-authored-by: JJ Kasper <jj@jjsweb.site>
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