Tests: Add cycles test for baking to a color attribute
This commit adds a file that bakes ambient occlusion to the color attribute of a mesh, then bakes the color attribute to a texture and saves that as the test image. This test is being done to make sure the `bake_offset_towards_center` function is tested as it is necessary to fix some bugs with color attribute baking (blender/blender#95969) Ref: blender/blender-test-data!73
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