Webot.cloud doesn't accept w3d format

[MNikoliCC]

Describe the Bug

When attempting to manually import a w3d scene or animation file, the process fails because webots.cloud still relies on the deprecated x3d format and does not yet support the w3d format.

Steps to Reproduce

1. Click on File->Share->Save as local files->Export scene/Record and export animation.
2. Save the file.
3. Try to import the saved w3d file manually on webots.cloud as clicking on Add a new animation/scene.
4. There is no option to import a w3d scene (default x3d).
5. Choose all in file manager and import a w3d file.
6. Try to run the imported scene/animation.
7. See error like: (error) File not found: storage/ScsE_N7/scene.x3d

Expected behavior
The default option should allow importing files in the x3d format.

Screenshots

System

• Operating System: Linux Ubuntu 22.04
• Graphics Card: RENOIR (renoir, LLVM 15.0.7, DRM 3.57, 6.8.0-49-generic)

Additional context
I suspect this is related to the PR #6280.