Allow 3D renderable texture in validation. (#3137)

Note that we still need to test that rendering to depth slices is valid,
that validation or depth slices not overlapping in beginRenderPass is
correct, etc.

src/webgpu/api/validation/createTexture.spec.ts

@@ -1060,7 +1060,7 @@ g.test('texture_usage')
     // if (!info.copyDst && (usage & GPUTextureUsage.COPY_DST) !== 0) success = false;
     if (!info.color?.storage && (usage & GPUTextureUsage.STORAGE_BINDING) !== 0) success = false;
     if (
-      (!info.renderable || appliedDimension !== '2d') &&
+      (!info.renderable || (appliedDimension !== '2d' && appliedDimension !== '3d')) &&
       (usage & GPUTextureUsage.RENDER_ATTACHMENT) !== 0
     )
       success = false;