PassNode: Clean up.

[Mugen87]

Related issue: #31390

Description

Implements some feedback from #31390.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.01 78.83	338.01 78.83	+0 B +0 B
WebGPU	557.52 154.28	557.41 154.27	-108 B -13 B
WebGPU Nodes	556.44 154.07	556.33 154.05	-108 B -13 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	469.26 113.53	469.26 113.53	+0 B +0 B
WebGPU	633.35 171.4	633.24 171.4	-108 B -8 B
WebGPU Nodes	588.48 160.72	588.38 160.72	-108 B -7 B