Remove edit_and_num_items_for_ged_from_str_simara function

We should remove edit_and_num_items_for_ged_from_str_simara function as it is not used. See https://gitlab.com/teklia/atr/dan/-/blob/66f0f92db68d23c1312c617c8556169b5423e18c/dan/manager/metrics.py#L543