Tests: Enable OptiX OSL generated volumetric texture coordinate tests

In a recent commit (1), a bug was fixed where the generated texture
coordinates on volumes in Cycles with OptiX OSL was incorrect.

Due to this fix, OptiX OSL now passes render tests in scenes that use
that feature, so this commit enables those tests on that platform.

(1) 0177537c9a

Pull Request: https://projects.blender.org/blender/blender/pulls/134629

tests/python/cycles_render_tests.py

@@ -80,10 +80,6 @@ BLOCKLIST_OPTIX_OSL = [
     'both_displacement.blend',
     'bump_with_displacement.blend',
     'ray_portal.blend',
-    # Volumetric textures using the Genereated textures coordinate are different in OptiX OSL. See 129279
-    'texture_coordinate_generated.blend',
-    'principled_absorption.blend',
-    'denoise_volume.blend',
     # The 3D texture doesn't have the right mappings
     'point_density_.*_object.blend',
     # Dicing tests use wireframe node which doesn't appear to be supported with OptiX OSL