[SPARK-43663][CONNECT][PS] Enable SeriesParityTests.test_compare

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

This PR proposes to enable `SeriesParityTests.test_compare` for Spark Connect.

### Why are the changes needed?

We should support the existing pandas-on-Spark APIs for Spark Connect as much as possible.

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

Yes, `Series.compare` is now available on Spark Connect.

### How was this patch tested?

Reusing the existing UT.

Closes #41567 from itholic/SPARK-43633.

Authored-by: itholic <haejoon.lee@databricks.com>
Signed-off-by: Ruifeng Zheng <ruifengz@apache.org>

python/pyspark/pandas/frame.py

@@ -4020,7 +4020,7 @@ def empty(self) -> bool:
         """
         return (
             len(self._internal.column_labels) == 0
-            or self._internal.resolved_copy.spark_frame.rdd.isEmpty()
+            or self._internal.resolved_copy.spark_frame.isEmpty()
         )
 
     @property

python/pyspark/pandas/tests/connect/series/test_parity_compute.py

@@ -22,10 +22,6 @@
 
 
 class SeriesParityComputeTests(SeriesComputeMixin, PandasOnSparkTestUtils, ReusedConnectTestCase):
-    @unittest.skip("TODO(SPARK-43663): Enable SeriesParityTests.test_compare.")
-    def test_compare(self):
-        super().test_compare()
-
     @unittest.skip(
         "TODO(SPARK-43611): Fix unexpected `AnalysisException` from Spark Connect client."
     )