[pipeline-connector][mysql] Enable send schema change by default (#2815)

This closes #2815.

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/main/java/com/ververica/cdc/connectors/mysql/source/MySqlDataSourceOptions.java

@@ -227,7 +227,7 @@ public class MySqlDataSourceOptions {
     public static final ConfigOption<Boolean> SCHEMA_CHANGE_ENABLED =
             ConfigOptions.key("schema-change.enabled")
                     .booleanType()
-                    .defaultValue(false)
+                    .defaultValue(true)
                     .withDescription(
-                            "Whether send schema change events, by default is false. If set to false, the schema changes will not be sent.");
+                            "Whether send schema change events, by default is true. If set to false, the schema changes will not be sent.");
 }

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/test/java/com/ververica/cdc/connectors/mysql/source/MySqlPipelineITCase.java

@@ -60,6 +60,7 @@ import java.util.Collections;
 import java.util.List;
 import java.util.stream.Stream;
 
+import static com.ververica.cdc.connectors.mysql.source.MySqlDataSourceOptions.SCHEMA_CHANGE_ENABLED;
 import static com.ververica.cdc.connectors.mysql.testutils.MySqSourceTestUtils.TEST_PASSWORD;
 import static com.ververica.cdc.connectors.mysql.testutils.MySqSourceTestUtils.TEST_USER;
 import static com.ververica.cdc.connectors.mysql.testutils.MySqSourceTestUtils.fetchResults;
@@ -114,7 +115,7 @@ public class MySqlPipelineITCase extends MySqlSourceTestBase {
                         .startupOptions(StartupOptions.initial())
                         .serverId(getServerId(env.getParallelism()))
                         .serverTimeZone("UTC")
-                        .includeSchemaChanges(true);
+                        .includeSchemaChanges(SCHEMA_CHANGE_ENABLED.defaultValue());
 
         FlinkSourceProvider sourceProvider =
                 (FlinkSourceProvider) new MySqlDataSource(configFactory).getEventSourceProvider();
@@ -242,7 +243,7 @@ public class MySqlPipelineITCase extends MySqlSourceTestBase {
                         .startupOptions(StartupOptions.latest())
                         .serverId(getServerId(env.getParallelism()))
                         .serverTimeZone("UTC")
-                        .includeSchemaChanges(true);
+                        .includeSchemaChanges(SCHEMA_CHANGE_ENABLED.defaultValue());
 
         FlinkSourceProvider sourceProvider =
                 (FlinkSourceProvider) new MySqlDataSource(configFactory).getEventSourceProvider();