WebGPURenderer: Support unfilterable float32 StorageTextures

[sunag]

Fixes #33147

Description

This PR allows the use of FloatType StorageTextures devices that do not support the float32-filterable.

Previously, the fallback to set the sampleType to unfilterable (when filtering was not supported) strictly checked if the texture was a DataTexture or its variants.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	359.27 85.31	359.27 85.31	+0 B +0 B
WebGPU	630.15 174.94	630.16 174.94	+6 B +0 B
WebGPU Nodes	628.73 174.69	628.74 174.69	+6 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	491.13 119.74	491.13 119.74	+0 B +0 B
WebGPU	703.4 189.9	703.41 189.9	+6 B -1 B
WebGPU Nodes	652.63 177.32	652.64 177.32	+6 B -1 B