Remove App.image_dic

I believe you said image_dic is not required.
The only place I see it is here :

    def __array_ufunc__(self, ufunc, method, *inputs, **kwargs) -> App:
        if method == "__call__":
            # Converting potential pyotb inputs to arrays
            arrays = []
            image_dic = None
            for inp in inputs:
                if isinstance(inp, (float, int, np.ndarray, np.generic)):
                    arrays.append(inp)
                elif isinstance(inp, OTBObject):
                    image_dic = inp.export()
                    arrays.append(image_dic["array"])
                else:
                    logger.debug(type(self))
                    return NotImplemented
            # Performing the numpy operation
            result_array = ufunc(*arrays, **kwargs)
            result_dic = image_dic
            result_dic["array"] = result_array
            # Importing back to OTB, pass the result_dic just to keep reference
            pyotb_app = App("ExtractROI", image_dic=result_dic, frozen=True, quiet=True)
            if result_array.shape[2] == 1:
                pyotb_app.app.ImportImage("in", result_dic)
            else:
                pyotb_app.app.ImportVectorImage("in", result_dic)
            pyotb_app.execute()
            return pyotb_app

In App it does nothing.

If possible we should remove it from App. What is this reference ? If image_dic is just numpy data, is it required to keep the ref after we call ImportImage ?

What about https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/-/issues/1824 ?