E.g. a user may request pharmr::remove_iiv("V"), to remove
IIV on the central volume. But if in the model the central volume is actually
parametrized as V1 or V2, then it will error. When wrapped in
find_pk_parameter this adds more safety. It will first look if the
parameter is used in the model as such. If not found directly, it will
attempt other common names for the parameter, depending on the ADVAN number
of the model.