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0eeee618 - Adds an advanced version of the SD-XL DreamBooth LoRA training script supporting pivotal tuning (#5883)

Adds an advanced version of the SD-XL DreamBooth LoRA training script supporting pivotal tuning (#5883) * sdxl dreambooth lora training script with pivotal tuning * bug fix - args missing from parse_args * code quality fixes * comment unnecessary code from TokenEmbedding handler class * fixup --------- Co-authored-by: Linoy Tsaban <linoy@huggingface.co>