Global: Remove deprecated code.

[Mugen87]

Related issue: #32569

Description

More code removal.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	355.69 84.54	355.56 84.51	-131 B -29 B
WebGPU	617.48 171.3	617.29 171.26	-188 B -38 B
WebGPU Nodes	616.08 171.05	615.89 171.01	-188 B -39 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	487.86 119.41	487.73 119.38	-131 B -33 B
WebGPU	688.93 187.08	688.74 187.04	-190 B -35 B
WebGPU Nodes	638.77 174.27	638.58 174.23	-190 B -45 B