WebGPURenderer: Improve compatibility test for reversed depth buffer.

[Mugen87]

Fixed #33076.

Description

The PR makes sure WebGPURenderer only uses a reversed depth buffer if EXT_clip_control is actually available. If not, it reports a warning and falls back to the default depth buffer.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	359.57 85.37	359.57 85.37	+0 B +0 B
WebGPU	626.63 174.17	626.83 174.23	+205 B +62 B
WebGPU Nodes	625.21 173.92	625.41 173.98	+205 B +65 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	491.31 119.78	491.31 119.78	+0 B +0 B
WebGPU	700.22 189.16	700.42 189.22	+206 B +66 B
WebGPU Nodes	649.42 176.52	649.63 176.58	+206 B +65 B

[Mugen87]

That is strange. I definitely clicked on Squash and merge and the PR has been merged according to the commit history.

But GitHub shows this PR as closed with unmerged commits...