Regression: Grouping by an expression with an alias results in `Schema error: Schema contains duplicate unqualified field name`

[alamb]

Describe the bug

If you use the DataFrame API or LogicalPlanBuilder to group using an expression that is aliased to the same name as an existing column (which you can't do directly via SQL) it will error with Schema error: Schema contains duplicate unqualified field name

To Reproduce

      #[tokio::test]
    async fn test_aggregate_alias() -> Result<()> {
        let df = test_table().await?;

        let df = df
            // GROUP BY `c2 + 1`
            .aggregate(vec![col("c2") + lit(1)], vec![])?
            // SELECT `c2 + 1` as c2
            .select(vec![(col("c2") + lit(1)).alias("c2")])?
            // GROUP BY c2 as "c2" (alias in expr is not supported by SQL)
            .aggregate(vec![col("c2").alias("c2")], vec![])?;

        let df_results = df.collect().await?;

        #[rustfmt::skip]
        assert_batches_sorted_eq!([
                "+----+",
                "| c2 |",
                "+----+",
                "| 2  |",
                "| 3  |",
                "| 4  |",
                "| 5  |",
                "| 6  |",
                "+----+",
            ],
            &df_results
        );

        Ok(())
    }

Will error with

Error: SchemaError(DuplicateUnqualifiedField { name: "c2" })

As the code in XXX will introduce a duplicate copy of c2

Expected behavior

The test should pass

Additional context

This is a regression introduced in #8356. The test passes prior to that PR and fails after warts

8f9d6e3

Error querying: Tonic(Status { code: InvalidArgument, message: "Error while planning query: Schema error: Schema contains duplicate unqualified field name time", metadata: MetadataMap { headers: {"content-type": "application/grpc", "date": "Fri, 22 Dec 2023 15:46:50 GMT", "content-length": "0"} }, source: None })