WebGPURenderer: Fix missing updates to geometry attributes

[RenaudRohlinger]

Fixed: #29582
Related: #29386

Description
This PR fixes an issue in NodeMaterialObserver where changes to geometry attributes or properties were not consistently reflected in the material, ensuring proper updates and synchronization between geometry and shaders.

This contribution is funded by Utsubo

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	689.82 170.9	689.82 170.9	+0 B +0 B
WebGPU	811.56 218.6	812.39 218.82	+835 B +217 B
WebGPU Nodes	811.07 218.47	811.9 218.69	+835 B +216 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	462.84 111.78	462.84 111.78	+0 B +0 B
WebGPU	535.78 144.59	536.62 144.83	+835 B +239 B
WebGPU Nodes	491.89 134.34	492.73 134.56	+835 B +223 B