Convert synonyms to ambiguous synonyms if the same canonical name exists multiple times

[mdoering]

example Papilio hippothoe: https://www.checklistbank.org/dataset/305209/names?q=Papilio%20hippothoe

There are some ambiguous synonyms included from the base, but the ones later merged in might be regular synonyms.
Create a procedure similar to detecting accepted homonyms that changes the status.