Restore some parts of the progression api some legacy components (like codemap) use. #78836
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Importantly, these are not the APIs that plug into Solution Explorer. This is basically just an api to take the Roslyn symbol model and return them as 'progression graph node' (similar to code model) that otehr tools then peek into for finding things like names and whatnot.
We really want to get those components off of this. But that's not happening just yet. So for now, preserve this code.