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e89ab5bc - SDXL ControlNet Union pipelines, make control_image argument immutible (#10663)

SDXL ControlNet Union pipelines, make control_image argument immutible (#10663) controlnet union XL, make control_image immutible when this argument is passed a list, __call__ modifies its content, since it is pass by reference the list passed by the caller gets its content modified unexpectedly make a copy at method intro so this does not happen Co-authored-by: Teriks <Teriks@users.noreply.github.com>