Nodes: Fix recursion with environment nodes.

[Mugen87]

Fixed #30255.

Description

This fixes the recursion issue when using NormalMapNode with EnvironmentNode.

The root cause is that EnvironmentNode modifies the builder's context with a custom getUV() which relies on transformedNormalView. Using this TSL object triggers setupNormal() which consequently triggers the build of NormalMapNode which now uses an invalid getUV() implementation.

@sunag Granted this is a bit of an edge case but this kind of context behavior might be unexpected in other scenarios as well. It would be great to limit the scope of context() somehow so code like in NormalMapNode wouldn't be necessary.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	339.49 79.09	339.49 79.09	+0 B +0 B
WebGPU	489.97 135.94	489.97 135.94	+0 B -3 B
WebGPU Nodes	489.44 135.82	489.44 135.82	+0 B -2 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.35 112.14	465.35 112.14	+0 B +0 B
WebGPU	559.35 151.41	559.35 151.41	+0 B -3 B
WebGPU Nodes	515.42 141.19	515.45 141.2	+20 B +4 B

[sunag]

I removed context inheritance for setupNormal() and setupClearcoatNormal() . Previously this was only being applied to non-node materials. I think this way it will get a larger scope in use cases like bumpMap for example.

[Mugen87]

LGTM!