Turbopack: don't compute all paths for builds (#73036)
Depends on https://github.com/vercel/next.js/pull/73010
A very small speedup, mostly noticeable in cpu time, not really in wall
time
```
before:
504.86s user 73.31s system 792% cpu 1:12.93 total
522.09s user 76.70s system 778% cpu 1:16.94 total
503.73s user 68.78s system 818% cpu 1:09.92 total
after:
471.20s user 61.73s system 757% cpu 1:10.33 total
481.69s user 69.05s system 805% cpu 1:08.33 total
```
