test: fix intermittent failure in cte.slt

[jonahgao]

Which issue does this PR close?

Closes #9930.

Rationale for this change

The RepartitionExec above RecursiveQueryExec may cause the result of this query to be non-deterministic.

DataFusion CLI v37.0.0
❯ explain WITH RECURSIVE my_cte AS(
    SELECT 1::int AS a
    UNION ALL
    SELECT a::bigint+2 FROM my_cte WHERE a<3
) SELECT *, arrow_typeof(a) FROM my_cte;
+---------------+---------------------------------------------------------------------------------------------+
| plan_type     | plan                                                                                        |
+---------------+---------------------------------------------------------------------------------------------+
| physical_plan | ProjectionExec: expr=[a@0 as a, arrow_typeof(a@0) as arrow_typeof(my_cte.a)]                |
|               |   RepartitionExec: partitioning=RoundRobinBatch(12), input_partitions=1                     |
|               |     RecursiveQueryExec: name=my_cte, is_distinct=false                                      |
|               |       ProjectionExec: expr=[1 as a]                                                         |
|               |         PlaceholderRowExec                                                                  |
|               |       CoalescePartitionsExec                                                                |
|               |         ProjectionExec: expr=[CAST(CAST(a@0 AS Int64) + 2 AS Int32) as my_cte.a + Int64(2)] |
|               |           CoalesceBatchesExec: target_batch_size=8192                                       |
|               |             FilterExec: a@0 < 3                                                             |
|               |               RepartitionExec: partitioning=RoundRobinBatch(12), input_partitions=1         |
|               |                 WorkTableExec: name=my_cte                                                  |
|               |                                                                                             |
+---------------+---------------------------------------------------------------------------------------------+
1 row(s) fetched.
Elapsed 0.018 seconds.

What changes are included in this PR?

Add rowsort to make the query result deterministic.

Are these changes tested?

Yes

Are there any user-facing changes?

No

[comphead]

lgtm thanks @jonahgao nice catch

[alamb]

FYI @peter-toth

Thanks @jonahgao and @comphead