Remove duplicated alias in Sort

### Describe the bug

```
query TT
explain SELECT count(*) order by count(*);
----
logical_plan
01)Projection: count(*)
02)--Sort: count(Int64(1)) AS count(*) AS count(*) ASC NULLS LAST
03)----Projection: count(Int64(1)) AS count(*), count(Int64(1))
04)------Aggregate: groupBy=[[]], aggr=[[count(Int64(1))]]
05)--------EmptyRelation
physical_plan
01)ProjectionExec: expr=[1 as count(*)]
02)--PlaceholderRowExec
```

We can see that Sort has two `count(*)`

`Sort: count(Int64(1)) AS count(*) AS count(*) ASC NULLS LAST`

I think ideally we should has single alias

### To Reproduce

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

No files or tests are named. Start by reproducing the shown EXPLAIN query and trace the logical or physical Sort plan that formats `count(Int64(1)) AS count(*) AS count(*)`; done means the Sort output contains only one `count(*)` alias.

Written by the indexing model from the issue text.