SD 1.5 Support For Advanced Lora Training (train_dreambooth_lora_sdxl…

…_advanced.py) (huggingface#6449)

* sd1.5 support in separate script

A quick adaptation to support people interested in using this method on 1.5 models.

* sd15 prompt text encoding and unet conversions

as per @linoytsaban 's recommendations. Testing would be appreciated,

* Readability and quality improvements

Removed some mentions of SDXL, and some arguments that don't apply to sd 1.5, and cleaned up some comments.

* make style/quality commands

* tracker rename and run-it doc

* Update examples/advanced_diffusion_training/train_dreambooth_lora_sd15_advanced.py

* Update examples/advanced_diffusion_training/train_dreambooth_lora_sd15_advanced.py

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Co-authored-by: Linoy Tsaban <[email protected]>