Bindings: Fix caching of texture bindings.

[Mugen87]

Related issue: #31751

Description

I was still experiencing warnings with the WebGPU backend in some occasions. After more debugging, I found out that caching bind groups (which is only done for WebGPU) must not be allowed if binding.generation was set to true. In this case a new GPU texture has been created which must be reflected in the bind group.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.91 79.11	338.91 79.11	+0 B +0 B
WebGPU	578.22 159.27	578.23 159.27	+5 B +1 B
WebGPU Nodes	576.83 159.03	576.83 159.03	+5 B +1 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	470.78 113.9	470.78 113.9	+0 B +0 B
WebGPU	648.76 175.3	648.76 175.3	+5 B -1 B
WebGPU Nodes	602.85 164.42	602.86 164.43	+5 B +4 B

[Mugen87]

@sunag BTW: The new generation flag was super helpful to identify/isolate this use case!