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738c9869 - [`Refactor`] `StableDiffusionReferencePipeline` inheriting from `DiffusionPipeline` (#7071)

[`Refactor`] `StableDiffusionReferencePipeline` inheriting from `DiffusionPipeline` (#7071) Refactor StableDiffusionReferencePipeline to inherit from DiffusionPipeline rather than StableDiffusionPipeline