[SPARK-40419][SQL][TESTS][FOLLOW-UP] Fix test to skip when package is unavailable

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

This PR follow-up for apache#37873.

The UDAF test should be skipped when pyspark, pandas and/or pyarrow is unavailable with proper message.

### Why are the changes needed?

Skip the test properly when it's unavailable.

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

No, it's test only.

### How was this patch tested?

Manually test to be skipped when missing package.

![Screen Shot 2022-09-20 at 6 11 30 PM](https://user-images.githubusercontent.com/44108233/191218078-254605b4-157e-4e22-8015-22399ff5e0b2.png)

Closes apache#37946 from itholic/SPARK-40419-followup.

Authored-by: itholic <[email protected]>
Signed-off-by: Hyukjin Kwon <[email protected]>

Author: itholic

sql/core/src/test/scala/org/apache/spark/sql/SQLQueryTestSuite.scala

@@ -256,6 +256,13 @@ class SQLQueryTestSuite extends QueryTest with SharedSparkSession with SQLHelper
           s"pandas and/or pyarrow were not available in [$pythonExec].") {
           /* Do nothing */
         }
+      case udfTestCase: UDFTest
+          if udfTestCase.udf.isInstanceOf[TestGroupedAggPandasUDF] &&
+            !shouldTestGroupedAggPandasUDFs =>
+        ignore(s"${testCase.name} is skipped because pyspark," +
+          s"pandas and/or pyarrow were not available in [$pythonExec].") {
+          /* Do nothing */
+        }
       case _ =>
         // Create a test case to run this case.
         test(testCase.name) {