Query: consider pruning orderby from subquery projection if we don't end up using it on the outside

Issue pointed out by @roji

Example query:

```cs
ss.Set().OrderBy(x => x.FullName).Take(10)
```

result sql:

```sql
@__p_0='10'

SELECT COUNT(*)
FROM (
SELECT TOP(@__p_0) [g].[Nickname], [g].[SquadId], [g].[FullName]
FROM [Gears] AS [g]
ORDER BY [g].[FullName]
) AS [t]
```

we don't end up needing the order by FullName anywhere (because count), so we technically don't need it in the subquery projection