test was missing the skip for non-supported timezones

Signed-off-by: Navin Kumar <[email protected]>

integration_tests/src/main/python/date_time_test.py

@@ -429,6 +429,7 @@ def test_string_unix_timestamp_ansi_exception():
         conf=ansi_enabled_conf)
 
 @tz_sensitive_test
+@pytest.mark.skipif(not is_supported_time_zone(), reason="not all time zones are supported now, refer to https://github.com/NVIDIA/spark-rapids/issues/6839, please update after all time zones are supported")
 @pytest.mark.parametrize('parser_policy', ["CORRECTED", "EXCEPTION"], ids=idfn)
 def test_to_timestamp(parser_policy):
     gen = StringGen("[0-9]{3}[1-9]-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]) ([0-1][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]")