Remove the "_new_ suffix from class names in pydocfodder

[serhiy-storchaka]

Previously this file contained two sets of classes: old-style classes and new-style classes. In Python 3 they are the same, and the set of "old-style" classes was removed in #99430. Classes that remain have the "_new" suffix which is useless, because all classes are now "new-style" classes. I'm planning to add more tests here, so the redundant suffix will only get in the way.

Linked PRs

• gh-113468: Remove the "_new_ suffix from class names in pydocfodder #113469
• [3.12] gh-113468: Remove the "_new_ suffix from class names in pydocfodder (GH-113469) #113483
• [3.11] gh-113468: Remove the "_new_ suffix from class names in pydocfodder (GH-113469) #115300