WebGPU: more changes and fixes for stencil support #12452
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When a texture has both a depth and stencil aspects, only one of these can be used in a texture lookup. So, when creating a texture view, we must choose between depth and stencil.
We currently choose "depth" as it is what the user would most likely want, but we will need to come up with a way to be able to specify "stencil" instead. However, I don't know how we can do that, that would require some annotations in the shader so that we know a texture should be bound with the stencil aspect...