Added some test scenes to lightweight pipeline. Fixed the multiple point lights test scene.

Assets/Tests/GraphicsTests/RenderPipeline/LightweightPipeline/Scenes/MultiplePointLights.unity

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Assets/Tests/GraphicsTests/RenderPipeline/LightweightPipeline/Scenes/Shaders/StandardBlinnPhongShader/LightweightLights.unity

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Assets/Tests/GraphicsTests/RenderPipeline/LightweightPipeline/Scenes/Shaders/StandardPBRShader/EnvironmentBRDF_Spheres.unity

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