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99de4cea - [tests] refactor test_models_unet_spatiotemporal.py to use modular testing mixins

[tests] refactor test_models_unet_spatiotemporal.py to use modular testing mixins Refactored the spatiotemporal UNet test file to follow the modern modular testing pattern with BaseModelTesterConfig and focused test classes: - UNetSpatioTemporalTesterConfig: Base configuration with model setup - TestUNetSpatioTemporal: Core model tests (ModelTesterMixin, UNetTesterMixin) - TestUNetSpatioTemporalAttention: Attention-related tests (AttentionTesterMixin) - TestUNetSpatioTemporalMemory: Memory/offloading tests (MemoryTesterMixin) - TestUNetSpatioTemporalTraining: Training tests (TrainingTesterMixin) - TestUNetSpatioTemporalLoRA: LoRA adapter tests (LoraTesterMixin) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>