Minor: Fix two test cases causing CI failures

[2010YOUY01]

Which issue does this PR close?

Closes #.

Rationale for this change

I encountered a CI failure in https://github.com/apache/datafusion/actions/runs/11995648362/job/33439273622?pr=13540

External error: query result mismatch:
[SQL] select make_array(make_array(1)) x UNION ALL SELECT make_array(arrow_cast(make_array(-1), 'LargeList(Int8)')) x;
[Diff] (-expected|+actual)
-   [[-1]]
-   [[1]]
+   [[1]]
+   [[-1]]
at test_files/union.slt:775

I think for UNION ALL statements, output order is not deterministic
So this PR specified the output order in failed test cases.

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?