Config: Fix eslint for test and .gitignore

[s-rigaud]

Description

Currently npm run lint-utils ends up parsing prettify and fuse library outputing 9456 errors.
While running npm run test-threeshake two bundle files are not properly ignored.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.65 78.39	336.65 78.39	+0 B +0 B
WebGPU	522.23 144.94	522.23 144.94	+0 B +0 B
WebGPU Nodes	521.7 144.84	521.7 144.84	+0 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.64 112.24	465.64 112.24	+0 B +0 B
WebGPU	592.61 160.56	592.61 160.56	+0 B +0 B
WebGPU Nodes	547.74 150	547.74 150	+0 B +0 B