Optimize performance for baked vertex animations

[Popov72]

Optimize performances in a "Not using scale" mode (send only translation+quaternion to the shader, not a whole mat4x4).

See:

• https://forum.babylonjs.com/t/baked-animation-performance/32023
• https://forum.babylonjs.com/t/skeletal-mesh-performance/40522

[github-actions]

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