ExportRoot cannot be animated

[knottttt]

Environments (please complete the following information):

• UniVRM version: 0.124.2
• Unity version: Unity-2022.3.3
• OS: Windows 11

Describe the bug

Here is the asset, unzip it under Asset.
Bull.zip

I need to export this asset with animation clips by GLTF format, no idea what makes it cannot be export.

[ousttrue]

The reason why the root animation is not recorded is that the root is not exported as a node.

However, for glb exports only, you can add the ability to export root as a node.

#2407