Stop subquery pushdown for OrderBy over Distinct

For the following query:

```c#
_ = await context.Blogs.Distinct().OrderBy(b => b.Id).ToListAsync()
```

We currently produce:

```sql
SELECT [t].[Id], [t].[Name]
FROM (
SELECT DISTINCT [b].[Id], [b].[Name]
FROM [Blogs] AS [b]
) AS [t]
ORDER BY [t].[Id]
```

But the pushdown isn't needed, we can generate this instead (note that ORDER BY is processed after DISTINCT in SQL):

```sql
SELECT DISTINCT [b].[Id], [b].[Name]
FROM [Blogs] AS [b]
ORDER BY [t].[Id]
```