[FLINK-36247][cdc-connector][mysql] Fix potential transaction leak during MySQL snapshot phase (#3602)

Author: gong

flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/main/java/org/apache/flink/cdc/connectors/mysql/source/utils/StatementUtils.java

@@ -235,7 +235,6 @@ public static String quote(TableId tableId) {
     private static PreparedStatement initStatement(JdbcConnection jdbc, String sql, int fetchSize)
             throws SQLException {
         final Connection connection = jdbc.connection();
-        connection.setAutoCommit(false);
         final PreparedStatement statement = connection.prepareStatement(sql);
         statement.setFetchSize(fetchSize);
         return statement;