Query: Injecting into group by projection should check for distinct

[smitpatel]

#27931 Added processing for lifting complex aggregate term to original group by query. See EnclosingTermFindingVisitor

Adding it should be safe in presence of GroupBy since that element could be key or aggregate only (else LINQ wouldn't compile)
But in front of Distinct it may not work. Though there is also another thing that if user doesn't condense grouping element then Distinct should/could fail. We just need to verify the scenario to make sure we are not adding terms into distinct projection.

Similar to #28039