Centralize disambiguation code

[waldekmastykarz]

In several get commands that support retrieving items by titles, we have logic that prompts the user to disambiguate which item to return when multiple items with the specified title are found. As we strive to implement retrieving items by titles/names wherever possible, we'll likely need similar logic in more places. To avoid duplicating the code, we should centralize it. What's more, if we choose to proceed with #2880, it would help us to minimize the amount of duplicate code.