[MAPS3D-2137] Fix elevation in underpasses for models: HD roads trees, road signs etc (#9229)

The style has additional set of trees defined in hd roads source and
that is the reason that we can elevate them - otherwise, Standard trees
wouldn't be elevated.

render test added:

<img width="512" height="512" alt="image"
src="https://github.com/user-attachments/assets/80997f50-fbfd-4e2a-87fa-7c0166313850"
/>

before:

<img width="512" height="512" alt="image"
src="https://github.com/user-attachments/assets/fbae7399-5333-4eca-9d84-be24d0cc5a0d"
/>

public message:

<public>
Properly position 3D models in roads underpass areas (#9229)
</public>

TODO:
- [x] gl native
- [x] trees road elevation is applicable only to road models and there
is no need to allocate memory for the array

cc @mapbox/gl-native
cc @mapbox/gl-js

cc @mapbox/maps-ios
cc @mapbox/maps-android

---------

Co-authored-by: Lasse Lammi <lasse.lammi@mapbox.com>
Co-authored-by: Changelog autocreator bot <actions@github.com>
GitOrigin-RevId: ca150daa42638aff883d83c899a2b6c297f30dee

Author: 3 people