ClippingNode: Move uniforms into render group.

[Mugen87]

Fixed #31708.

Description

#31708 shows that clipping fails when meshes share the same material since bindings are not correctly updated. The cache hit prevents the update of clipping uniforms which are in the object scope right now.

Since these data are equal for all render items that use a specific clipping node instance, we can move the data into the render UBO scope.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.91 79.1	338.91 79.1	+0 B +0 B
WebGPU	577.1 159.18	577.16 159.18	+65 B +7 B
WebGPU Nodes	575.71 158.93	575.77 158.94	+65 B +7 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	470.7 113.91	470.7 113.91	+0 B +0 B
WebGPU	647.66 175.14	647.72 175.15	+65 B +9 B
WebGPU Nodes	601.76 164.31	601.82 164.31	+65 B +4 B