Add reference images for second light attenuation test scene

com.unity.testing.srp.lightweight/Tests/ReferenceImages/Linear/OSXEditor/Metal/055_Lighting_Attenuation_Spot_Point.png.meta

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com.unity.testing.srp.lightweight/Tests/ReferenceImages/Linear/WindowsEditor/Direct3D11/055_Lighting_Attenuation_Spot_Point.png.meta

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