Fix used extension check false positive from usused object or behavior events

[D8H]

• Some extensions have control behaviors for several built-in movement behavior but most examples only use one of them.
• All built-in movement behaviors were added to the list of used extension in the example pages.
• It was detected by the example repository CI that check the Platformer example metadata:
  https://app.circleci.com/pipelines/github/GDevelopApp/GDevelop-examples/2454/workflows/44f09388-b5f0-4b48-ad5d-c317b8dfa99e/jobs/7384
• For instance the top-down RPG example is wrongly tagged as using the 3D Physics behavior, the Platformer behavior...
  https://gdevelop.io/game-example/free/top-down-rpg