fix(carto): render PointLabelLayer backgrounds

[cyphercodes]

Closes #10486

Change List

• Keep PointLabelLayer's expanded collision background separate from its visual TextLayer background.
• Forward visual background color, border, radius, and padding properties.
• Add unit and golden-image regression coverage.

Testing

• yarn vitest run --project headless test/modules/carto/layers/point-label-layer.spec.ts
• yarn vitest run --project render test/render/test-cases/text-layer.spec.ts -t point-label-layer-background
• yarn test-fast
• yarn build