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0411da77 - [tests] refactor test_models_unet_2d.py to use modular testing mixins

[tests] refactor test_models_unet_2d.py to use modular testing mixins Refactor UNet2D model tests (standard, LDM, NCSN++) to follow the modern testing pattern. Each variant gets its own config class and dedicated test classes organized by concern (core, memory, training, LoRA, hub loading). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>