Stop baking LH to RH in glTF serializer

[bghgary]

Fixes #13891

See https://forum.babylonjs.com/t/glb-export-fails/40911

We used to try to bake the LH to RH conversion into the data. This change makes it such that it just puts a negative scale at the root instead. Doing the data conversion is too complex and probably isn't super beneficial to users.

[bjsplat]

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[bjsplat]

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[bjsplat]

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To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

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[bjsplat]

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[bjsplat]

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[bghgary]

@sebavan I made some more changes to fix tests if you can take a look. Once reviewed, it should be ready to merge.

[Popov72]

Our life would be so much easier without this crappy handedness thing!

[bjsplat]

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[HoferMarkus]

Hi @bghgary,
this change seems to break certain gltf exports, see this PG example.
Seems like all faces are flipped when starting the gltf export via inspector.

In versions before 6.7.0 it looks correct.

[bghgary]

Thanks for the report! Do you mind filing a new issue for tracking purposes?