Similar to what was done for git #tuleap/stable/6bac1b569739441da9ba0406ba9274399fa42c2d, we should not mix constructor methods for List Bind objects within the OpenListFieldBuilder. Building list fields requires two different builders, but that's the way the production code is. Trying to mix them together makes it hard to untangle, and makes the builder more complicated. We can let the caller decide how they want to create the open list field and then pass it to the builder for the List Bind.