Add additional benchmarks to `picking::ray_mesh_intersection`

In order to merge #18232 (originally #16148), the improvements to our benchmarks had to be reverted in order to avoid merge conflicts. These changes are still generally useful, however, and would improve our `picking` benchmarks if integrated.

Specifically, changes changes made to `ray_mesh_intersection.rs` [here](https://github.com/tbillington/bevy/blob/60b6c516fa09ddce0e73070b6fac682a150de4ff/benches/benches/bevy_picking/ray_mesh_intersection.rs) need to be combined with the changes made in #17033, which caused the merge conflict.

Compare benches/benches/bevy_picking/ray_mesh_intersection.rs at the linked commit with its current version, then review the benchmark changes from #17033 and the context of #18232. Combine the still-useful benchmark improvements without reintroducing the merge conflict, and confirm the picking benchmarks build and run successfully.

Written by the indexing model from the issue text.