[BUG] spark 3.1.0 udf_cudf_test fail without specifying --cudf-udf option

[tgravescs]

Describe the bug
Looks like the tests still runs the @pandas_udf code even though we say skip the file.

==================================== ERRORS ====================================
______________ ERROR collecting src/main/python/udf_cudf_test.py _______________
ImportError while importing test module '/home/tgraves/workspace/spark-rapids-another/integration_tests/src/main/python/udf_cudf_test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
src/main/python/udf_cudf_test.py:76: in
@pandas_udf('int')
/home/tgraves/runspace/spark310/spark-3.1.0-SNAPSHOT-bin-hadoop3.2/python/lib/pyspark.zip/pyspark/sql/pandas/functions.py:324: in pandas_udf
require_minimum_pyarrow_version()
/home/tgraves/runspace/spark310/spark-3.1.0-SNAPSHOT-bin-hadoop3.2/python/lib/pyspark.zip/pyspark/sql/pandas/utils.py:57: in require_minimum_pyarrow_version
"your version was %s." % (minimum_pyarrow_version, pyarrow.version))
E ImportError: PyArrow >= 1.0.0 must be installed; however, your version was 0.15.1.

reproduce using spark 3.1.0 and just:

$SPARK_HOME/bin/spark-submit --master local --jars cudf-0.16-SNAPSHOT-cuda10-1.jar,rapids-4-spark_2.12-0.3.0-SNAPSHOT.jar --conf spark.driver.extraJavaOptions=-Duser.timezone=GMT --conf spark.sql.session.timeZone=UTC --conf spark.executor.extraJavaOptions=-Duser.timezone=GMT runtests.py