The opengl_draw_tests.py render test had a number of issues when
running, likely due to test data restructuring:
* Invalid CMakeLists.txt specification preventing tests from being added
* Invalid parameters to the `screenshot` function
This commit fixes both issues as well as renames the related files and
folders to better indicate their usage.
Pull Request: https://projects.blender.org/blender/blender/pulls/132838
