[SPARK-3401][PySpark] Wrong usage of tee command in python/run-tests

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #2272 from sarutak/SPARK-3401 and squashes the following commits:

2b35a59 [Kousuke Saruta] Modified wrong usage of tee command in python/run-tests

python/run-tests

@@ -33,7 +33,7 @@ rm -rf metastore warehouse
 
 function run_test() {
     echo "Running test: $1"
-    SPARK_TESTING=1 $FWDIR/bin/pyspark $1 2>&1 | tee -a > unit-tests.log
+    SPARK_TESTING=1 $FWDIR/bin/pyspark $1 2>&1 | tee -a unit-tests.log
     FAILED=$((PIPESTATUS[0]||$FAILED))
 
     # Fail and exit on the first test failure.