Support latents_mean and latents_std (#7132)
* update latents_mean and latents_std
* fix typos
* Update src/diffusers/pipelines/controlnet/pipeline_controlnet_sd_xl_img2img.py
* format
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Co-authored-by: ResearcherXman <xhs.research@gmail.com>
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: YiYi Xu <yixu310@gmail.com>
