Tests: Add a render test for triangle light sampling
The Cycles render engine switches between two triangle light sampling methods depending on the distance to the triangle, and the size of the triangle. In a earlier version of Blender, one of the sampling methods was broken during a refactor. This commit adds a test scene that clearly shows off both sampling systems so if it breaks again, it will easily and clearly be shown in the test results. References: Original bug report: blender/blender#117771 Fix commit: blender/blender@583af2a6e5 Test repository PR: blender/blender-test-data!42
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