[Improve][CDC] Filter ddl for snapshot phase (#8911)

Author: hailin0

Diff for: seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/mysql/source/reader/fetch/scan/MySqlSnapshotFetchTask.java

@@ -23,6 +23,7 @@
 import org.apache.seatunnel.connectors.cdc.base.source.split.SnapshotSplit;
 import org.apache.seatunnel.connectors.cdc.base.source.split.SourceSplitBase;
 import org.apache.seatunnel.connectors.cdc.base.source.split.wartermark.WatermarkKind;
+import org.apache.seatunnel.connectors.seatunnel.cdc.mysql.config.MySqlSourceConfigFactory;
 import org.apache.seatunnel.connectors.seatunnel.cdc.mysql.source.reader.fetch.MySqlSourceFetchTaskContext;
 import org.apache.seatunnel.connectors.seatunnel.cdc.mysql.source.reader.fetch.binlog.MySqlBinlogFetchTask;
 
@@ -152,6 +153,7 @@ private MySqlBinlogFetchTask.MySqlBinlogSplitReadTask createBackfillBinlogReadTa
                 context.getSourceConfig()
                         .getDbzConfiguration()
                         .edit()
+                        .with(MySqlSourceConfigFactory.SCHEMA_CHANGE_KEY, "false")
                         .with("table.include.list", split.getTableId().toString())
                         // Disable heartbeat event in snapshot split fetcher
                         .with(Heartbeat.HEARTBEAT_INTERVAL, 0)

Diff for: seatunnel-connectors-v2/connector-cdc/connector-cdc-oracle/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/oracle/source/reader/fetch/scan/OracleSnapshotFetchTask.java

@@ -23,6 +23,7 @@
 import org.apache.seatunnel.connectors.cdc.base.source.split.SnapshotSplit;
 import org.apache.seatunnel.connectors.cdc.base.source.split.SourceSplitBase;
 import org.apache.seatunnel.connectors.cdc.base.source.split.wartermark.WatermarkKind;
+import org.apache.seatunnel.connectors.seatunnel.cdc.oracle.config.OracleSourceConfigFactory;
 import org.apache.seatunnel.connectors.seatunnel.cdc.oracle.source.reader.fetch.OracleSourceFetchTaskContext;
 import org.apache.seatunnel.connectors.seatunnel.cdc.oracle.source.reader.fetch.logminer.OracleRedoLogFetchTask;
 
@@ -159,6 +160,7 @@ private OracleRedoLogFetchTask.RedoLogSplitReadTask createBackfillRedoLogReadTas
                 context.getSourceConfig()
                         .getDbzConfiguration()
                         .edit()
+                        .with(OracleSourceConfigFactory.SCHEMA_CHANGE_KEY, "false")
                         .with(
                                 "table.include.list",
                                 split.getTableId()