[Core][Reactive] The PropertySelector might not be generated using the ListFeed.Selection

[dr1rrb]

Current behavior

ListFeed.Selection might throw at runtime due to a OverloadResolutionFailure: All .Selection methods are considered as valid by roslyn ... but the build succeed anyway.

Expected behavior

We need to support multiple possible methods.

[nickrandolph]

@dr1rrb what's the priority on this?