RenderTarget: Fix resize of 3D textures.

[Mugen87]

Fixed #31693.

Description

Makes sure 3D textures don't get the isArrayTexture set to true during a resize. This currently happens and breaks the 3D texture in the backend. The texture is rendered black and the following WebGPU warning is logged:

Dimension (TextureViewDimension::e3D) of [TextureView "colorAttachment_0"] doesn't match the expected dimension (TextureViewDimension::e2DArray).
While validating entries[1] as a Sampled Texture.
Expected entry layout: {sampleType: TextureSampleType::Float, viewDimension: TextureViewDimension::e2DArray, multisampled: 0}
While validating [BindGroupDescriptor ""bindGroup_object""] against [BindGroupLayout (unlabeled)]
While calling [Device].CreateBindGroup([BindGroupDescriptor ""bindGroup_object""]).

You can reproduce the issue by making a resize of the 3D render target in webgpu_rendertarget_2d-array_3d.

I've added a TODO comment in the source since we maybe have to refactor the code from #30959 to avoid setting isArrayTexture in RenderTarget.setSize() and the ctor of Texture.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.24 79.14	338.24 79.14	+0 B +0 B
WebGPU	579.75 160.19	579.75 160.19	+0 B +0 B
WebGPU Nodes	578.36 159.95	578.36 159.95	+0 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	469.83 113.84	469.88 113.85	+41 B +12 B
WebGPU	649.45 175.84	649.49 175.85	+41 B +12 B
WebGPU Nodes	603.56 165	603.6 165.01	+41 B +12 B