Remove unsafe acceleration structure build

[Vecvec]

Connections

Description
Builds on #7303 by removing the unsafe acceleration structure build. This function was did not follow what most other underlying API functions were doing, and only removed a single CPU -> GPU copy (which the hal API still allows you to do). This allows lots of API simplifications as well as making it easier to maintain. The simplifications remove things that confused me when I began using this API that were not previously possible before removing the unsafe build. This is a fairly large API change (and a breaking change) for ray tracing, so feel free to comment on the updated design.

Testing
This doesn't add functionality, it just removes things.

Squash or Rebase?
Squash

Checklist

• Run cargo fmt.
• Run cargo clippy --tests.
• Run cargo xtask test to run tests.
• If this contains user-facing changes, add a CHANGELOG.md entry.