test: add a 2DRenderer scene in the URP test project (#586)

* add 2d renderer
* add BallsAndPlanes2D scene
* update asset
* save scenes
* save mat
* ignore 2D scenes for XR tests
* add reference images

Author: sindharta

TestProjects/UniversalGraphicsTest-6000.0/Assets/RP_Assets/2DRenderer.asset

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