WebGPURenderer: Add Support for Renderer Without Depth and Stencil Buffers

[RenaudRohlinger]

Description

Fixes the issue where initializing WebGPURenderer with depth: false was not functioning. This PR enables support for renderers without a depth-stencil buffer in both the WebGPU and WebGL backends.

This contribution is funded by Utsubo

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	687.47 170.27	687.47 170.27	+0 B +0 B
WebGPU	806.21 217.08	806.46 217.18	+257 B +103 B
WebGPU Nodes	805.71 216.94	805.97 217.05	+257 B +104 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	462.85 111.79	462.85 111.79	+0 B +0 B
WebGPU	535.66 144.58	535.92 144.69	+257 B +109 B
WebGPU Nodes	491.75 134.31	492 134.42	+257 B +108 B