OptiX OSL tests were previously disabled due to a GPU driver bug resulting in many tests failing unexpectedly. The new driver version is now out with the fix so we can now enable OptiX OSL testing. This commit also updates the OptiX OSL block list with better comments, and more tests that are known to fail and need investigating. Ref: #123012 Pull Request: https://projects.blender.org/blender/blender/pulls/129280