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1040dfd9 - [Fix] Multiple image conditionings in a single batch for `StableDiffusionControlNetPipeline` (#6334)

[Fix] Multiple image conditionings in a single batch for `StableDiffusionControlNetPipeline` (#6334) * [Fix] Multiple image conditionings in a single batch for `StableDiffusionControlNetPipeline`. * Refactor `check_inputs` in `StableDiffusionControlNetPipeline` to avoid redundant codes. * Make the behavior of MultiControlNetModel to be the same to the original ControlNetModel * Keep the code change minimum for nested list support * Add fast test `test_inference_nested_image_input` * Remove redundant check for nested image condition in `check_inputs` Remove `len(image) == len(prompt)` check out of `check_image()` Co-authored-by: YiYi Xu <yixu310@gmail.com> * Better `ValueError` message for incompatible nested image list size Co-authored-by: YiYi Xu <yixu310@gmail.com> * Fix syntax error in `check_inputs` * Remove warning message for multi-ControlNets with multiple prompts * Fix a typo in test_controlnet.py Co-authored-by: YiYi Xu <yixu310@gmail.com> * Add test case for multiple prompts, single image conditioning in `StableDiffusionMultiControlNetPipelineFastTests` * Improved `ValueError` message for nested `controlnet_conditioning_scale` * Documenting the behavior of image list as `StableDiffusionControlNetPipeline` input --------- Co-authored-by: YiYi Xu <yixu310@gmail.com>