ColorManagement: Improve Nomenclature.

[WestLangley]

Make the nomenclature more explicit -- and consistent.

See discussion in #30590 (comment).

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	337.26 78.64	337.26 78.64	+0 B +0 B
WebGPU	551.2 152.85	551.04 152.81	-168 B -43 B
WebGPU Nodes	550.55 152.7	550.39 152.66	-168 B -44 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	468.12 113.14	468.44 113.28	+324 B +146 B
WebGPU	625.84 169.43	626.05 169.5	+209 B +69 B
WebGPU Nodes	580.7 158.75	580.9 158.82	+209 B +69 B