Use native format for intermediate render texture

Steps to reproduce:

WebGPU currently always uses BGRA format for the intermediate render texture. GPUs have a preferred render texture format, either BGRA or RGBA. Using the preferred format for the intermediate render texture will provide some performance benefit.

Actual results: 

Expected results: 

Reproducible with versions: 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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