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6313645b - add `StableDiffusionXLKDiffusionPipeline` (#6447)

add `StableDiffusionXLKDiffusionPipeline` (#6447) --------- Co-authored-by: yiyixuxu <yixu310@gmail,com> Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>