Turbopack: less tasks in `with_modules` (#75700)
Way less turbo tasks
Less CPU time, 300mb less memory.
```
testing against 0293c96cf32
uncell AstPath 77d7015554 (PR below in this stack)
13,65 GB
TURBO_ENGINE_READ_ONLY=1 NEXT_TURBOPACK_TRACING= TURBOPACK=1 TURBOPACK_BUILD= 505.04s user 83.92s system 853% cpu 1:09.00 total
TURBO_ENGINE_READ_ONLY=1 NEXT_TURBOPACK_TRACING= TURBOPACK=1 TURBOPACK_BUILD= 509.03s user 84.26s system 829% cpu 1:11.53 total
snapshot in with_modules c2c661b1e9
13,3 GB
TURBO_ENGINE_READ_ONLY=1 NEXT_TURBOPACK_TRACING= TURBOPACK=1 TURBOPACK_BUILD= 491.50s user 79.78s system 856% cpu 1:06.69 total
TURBO_ENGINE_READ_ONLY=1 NEXT_TURBOPACK_TRACING= TURBOPACK=1 TURBOPACK_BUILD= 495.62s user 78.61s system 852% cpu 1:07.36 total
```
