chore(test): enable selected webgpu render tests

[Pessimistress]

Enable webgpu render tests for supported layers.

Still disabled:

• TextLayer (needs TextBackgroundLayer port)
• MVTLayer (blocked by ClipExtension)
• ScenegraphLayer (pending PR)
• Extensions
• Effects

[Pessimistress]

Notable gaps:

• contour-infoviz_border_ref renders empty images fix(core): clipspace depth in wgsl #10544
• SimpleMeshLayer renders empty image fix(mesh-layers): SimpleMeshLayer matrix constant #10543
• ColumnLayer & derivative layers flat mode - fill color is always white fix(layers): ColumnLayer flat mode in webgpu #10535
• H3Layer - top shading is incorrect fix(layers): WebGPU derivative-based normal calculation #10547
• Any tests concerning MercatorViewport wrapping only renders one world copy fix(core): render repeated map viewports correctly with WebGPU #10536

[coveralls]

coverage: 82.504% (-1.6%) from 84.119% — x/webgpu-render into master

[chrisgervang]

Thanks! I'll pull this into #10520 once merged. I suspect it will be a much smaller PR afterwards