[SPARK-50525][SQL][TESTS][FOLLOWUP] Fix DataFrameSuite.repartition by MapType test assumption

[dongjoon-hyun]

What changes were proposed in this pull request?

This is a follow-up to recover the NON-ANSI mode CI failure by adding a test assumption clearly.

• [SPARK-50525][SQL] Define InsertMapSortInRepartitionExpressions Optimizer Rule #49144

Why are the changes needed?

BEFORE

$ SPARK_ANSI_SQL_MODE=false build/sbt "sql/testOnly *.DataFrameSuite -- -z MapType"
[info] *** 1 TEST FAILED ***
[error] Failed tests:
[error] 	org.apache.spark.sql.DataFrameSuite

AFTER

$ SPARK_ANSI_SQL_MODE=false build/sbt "sql/testOnly *.DataFrameSuite -- -z MapType"
[info] All tests passed.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Manually test with SPARK_ANSI_SQL_MODE=false.

Was this patch authored or co-authored using generative AI tooling?

No.

[dongjoon-hyun]

cc @ostronaut and @cloud-fan

[cloud-fan]

thanks for the fix!

[dongjoon-hyun]

Thank you, @cloud-fan . Merged to master.

[ostronaut]

Thank you @dongjoon-hyun for fixing it! I was not aware that SPARK_ANSI_SQL_MODE might cause some issues.