[SPARK-28198][PYTHON][FOLLOW-UP] Run the tests of MAP ITER UDF in Jenkins
[SPARK-28198][PYTHON][FOLLOW-UP] Run the tests of MAP ITER UDF in Jenkins

### What changes were proposed in this pull request?

https://github.com/apache/spark/pull/24997 missed to add `pyspark.sql.tests.test_pandas_udf_iter` to `modules.py`. This PR adds it.

### Why are the changes needed?

Currently, Jenkins does not run the test cases. We should run them.

### Does this PR introduce any user-facing change?

No.

### How was this patch tested?

Jenkins should test.

Closes #27141 from HyukjinKwon/SPARK-28198-followup.

Authored-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>
Signed-off-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

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