[DreamBooth SDXL LoRA] Apply SNR min-weighting to prior preservation loss when snr_gamma is set#13797

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Dev-X25874:fix/dreambooth-sdxl-snr-prior-loss

Commits on May 23, 2026

examples/dreambooth: apply SNR min-weighting to prior loss when snr_gamma is set
Dev-X25874
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examples/dreambooth: add test for dreambooth lora sdxl with snr_gamma and prior preservation
Dev-X25874
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