Tests: Add Cycles tests for new volumetric scatter phase functions
Blender 4.3 added new volumetric scatter phase functions to Cycles. This commit adds tests for each of the new phase functions. Ref: blender/blender@0315eae536 Ref: blender/blender#123012 Ref: blender/blender-test-data!25 Pull Request: https://projects.blender.org/blender/blender/pulls/130894
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