Is your feature request related to a problem or challenge?

Follow up to #18857

With <slt:ignore> feature, if the actual and expected is not matched, we got error message like

2. query result mismatch:
[SQL] select * from generate_series(3);
[Diff] (-expected|+actual)
-   <slt:ignore>
+   0
    1
-   3<slt:ignore>
+   2
    3
at /Users/yongting/Code/datafusion/datafusion/sqllogictest/test_files/slt_features.slt:84

The first diff is a false positive, and the second one is expected. It would be great to suppress the 1st diff.

Also, the error message rendering and the actual validation for sqllogictest seems to live in two different places, it would be better to combine them.

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Additional context

No response