WebGLBackend: Fix depth formats.

[Mugen87]

Related issue: #30387

Description

This was found by @cabanier in #30387 (comment) 🎉 . The WebGL 2 backend of WebGPURenderer did not use the correct internal format when using depth textures with UnsignedIntType. Instead of gl.DEPTH24_STENCIL8, it should be gl.DEPTH_COMPONENT24.

Besides, the PR adds the missing support for THREE.UnsignedShortType.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.27 78.29	336.27 78.29	+0 B +0 B
WebGPU	516.71 143.46	516.75 143.47	+47 B +5 B
WebGPU Nodes	516.17 143.36	516.22 143.36	+47 B +4 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.25 112.13	465.25 112.13	+0 B +0 B
WebGPU	588.71 159.63	588.76 159.63	+47 B +5 B
WebGPU Nodes	544.1 149.19	544.14 149.2	+47 B +4 B