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c6e6992c - [tests] refactor test_models_unet_controlnetxs.py to use modular testing mixins

[tests] refactor test_models_unet_controlnetxs.py to use modular testing mixins Refactor UNetControlNetXSModel tests to follow the modern testing pattern with separate classes for core, memory, training, and LoRA. Specialized tests (from_unet, freeze_unet, forward_no_control, time_embedding_mixing) remain in the core test class. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>