fix: ignore example test class entirely

Author: yuxiqian

flink-cdc-connect/flink-cdc-source-connectors/flink-connector-db2-cdc/src/test/java/org/apache/flink/cdc/connectors/db2/Db2ParallelSourceExampleTest.java

@@ -30,10 +30,10 @@
 import static org.testcontainers.containers.Db2Container.DB2_PORT;
 
 /** Example Tests for {@link Db2IncrementalSource}. */
+@Disabled("Test ignored because it won't stop and is used for manual test")
 class Db2ParallelSourceExampleTest extends Db2TestBase {
 
     @Test
-    @Disabled("Test ignored because it won't stop and is used for manual test")
     void testDb2ExampleSource() throws Exception {
         initializeDb2Table("customers", "CUSTOMERS");
         Db2IncrementalSource<String> sqlServerSource =