Is it possible to remove a single interaction from an existing published pact without removing the releases? We have a pact for an error state that is no longer possible so we'd just like to delete that interaction from the contract. The existing consumers of the contract will still work because that interaction no longer occurs. But we don't want to delete the whole pact contract because that would mean we would no longer have a record of that release

Unfortunately not. I'd just brute force this one. Deploy the service that depends on it to prod and then it should be good for the next round of updates