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The function load_model_dict_into_meta was moved from modeling_utils.py to
model_loading_utils.py but the imports in the conversion scripts were not
updated, causing ImportError when running these scripts.

This fixes the import in 6 conversion scripts:
- scripts/convert_sd3_to_diffusers.py
- scripts/convert_stable_cascade_lite.py
- scripts/convert_stable_cascade.py
- scripts/convert_stable_audio.py
- scripts/convert_sana_to_diffusers.py
- scripts/convert_sana_controlnet_to_diffusers.py

Fixes #12606

fix syntax error

* update some docs and tests!

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Co-authored-by: Aryan <contact.aryanvs@gmail.com>
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Aryan <aryan@huggingface.co>
Co-authored-by: apolinário <joaopaulo.passos@gmail.com>

add conversion script