Rename iris.co_realise_data to CubeList.realise_data #3012
Description
As per #2967 (comment), follow through with moving the new iris.co_realise_data into CubeList.realise_data.
cc: @pp-mo
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As per #2967 (comment), follow through with moving the new iris.co_realise_data into CubeList.realise_data.
cc: @pp-mo