Add default 3D editor to 3D examples

[ClementPasteau]

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[github-actions]

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

• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/3d-car-coin-hunt/3d-car-coin-hunt.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/3d-endless-terrain/3d-endless-terrain.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/3d-first-person/3d-first-person.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/3d-platformer/3d-platformer.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/3d-road-crosser/3d-road-crosser.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/platformer-3d-wipeout/platformer-3d-wipeout.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3D-platformer/starting-3D-platformer.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-car-racing/starting-3d-car-racing.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-draggable-tiles/starting-3d-draggable-tiles.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-driving/starting-3d-driving.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-endless-runner/starting-3d-endless-runner.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-flight-sim/starting-3d-flight-sim.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-point-and-click-adventure/starting-3d-point-and-click-adventure.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-rts-unit-selection/starting-3d-rts-unit-selection.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-shootemup/starting-3d-shootemup.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-tank/starting-3d-tank.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-tile-placement/starting-3d-tile-placement.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-top-down-rpg/starting-3d-top-down-rpg.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-twin-stick-shooter/starting-3d-twin-stick-shooter.json
• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/update-3D-editor/examples/starting-3d-vampire-survivor/starting-3d-vampire-survivor.json

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This is an automatic message displaying links to the games in this PR - double check the JSON in case of doubt.