32bit floating point RenderTexture blending feature is not available for WebGPU

Reproduction steps:
1. Open the “IN-111674_WebGPUFloatingPointBlendBug” project
2. Open the “Assets/Scenes/SampleScene”
3. Enter the Play mode
4. Observe the color of the square in the Game view
5. Build and Run for Web
6. Observe the color of the square

Expected Result: The square in build looks the same as it does in Play mode
Actual Result: The square in build is missing the blue hue and looks different from the one in Play mode

Reproducible with: 6000.0.58f1, 6000.2.5f1, 6000.3.0b1

Reproducible on: MacOS 15.6.1 (M1 Max)
Not reproducible on: No other environments tested