[Car coin hunt] Use a mesh shape for the bridge

[D8H]

Require:

• https://github.com/4ian/GDevelop/pull/8080

[github-actions[bot]]

Preview the game(s) changed or added in this Pull Request

• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/mesh-shape/examples/3d-car-coin-hunt/3d-car-coin-hunt.json

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