[refactor] Remove flink/spark connectors (#8004)

As we discussed in dev@doris[1]
Flink/Spark connectors has been moved to new repo: https://github.com/apache/incubator-doris-connectors

[1] https://lists.apache.org/thread/hnb7bf0l6y6rzb9pr6lhxz3jjoo04skl

docs/en/extending-doris/flink-doris-connector.md

@@ -28,6 +28,8 @@ under the License.
 
 - The Flink Doris Connector can support operations (read, insert, modify, delete) data stored in Doris through Flink.
 
+Github: https://github.com/apache/incubator-doris-connectors
+
   * `Doris` table can be mapped to `DataStream` or `Table`.
 
   >**Note:**
@@ -377,4 +379,4 @@ WITH (
 );
 
 insert into doris_sink select id,name from cdc_mysql_source;
-```
+```

docs/en/extending-doris/spark-doris-connector.md

@@ -28,6 +28,8 @@ under the License.
 
 Spark Doris Connector can support reading data stored in Doris and writing data to Doris through Spark.
 
+Github: https://github.com/apache/incubator-doris-connectors
+
 - Support reading data from `Doris`.
 - Support `Spark DataFrame` batch/stream writing data to `Doris`
 - You can map the `Doris` table to` DataFrame` or `RDD`, it is recommended to use` DataFrame`.
@@ -244,4 +246,4 @@ kafkaSource.selectExpr("CAST(key AS STRING)", "CAST(value as STRING)")
 | TIME       | DataTypes.DoubleType             |
 | HLL        | Unsupported datatype             |
 
-* Note: In Connector, `DATE` and` DATETIME` are mapped to `String`. Due to the processing logic of the Doris underlying storage engine, when the time type is used directly, the time range covered cannot meet the demand. So use `String` type to directly return the corresponding time readable text.
+* Note: In Connector, `DATE` and` DATETIME` are mapped to `String`. Due to the processing logic of the Doris underlying storage engine, when the time type is used directly, the time range covered cannot meet the demand. So use `String` type to directly return the corresponding time readable text.

docs/zh-CN/extending-doris/flink-doris-connector.md

@@ -30,6 +30,8 @@ under the License.
 
 Flink Doris Connector 可以支持通过 Flink 操作（读取、插入、修改、删除） Doris 中存储的数据。
 
+代码库地址：https://github.com/apache/incubator-doris-connectors
+
 * 可以将`Doris`表映射为`DataStream`或者`Table`。
 
 >**注意：**
@@ -381,4 +383,4 @@ WITH (
 );
 
 insert into doris_sink select id,name from cdc_mysql_source;
-```
+```

docs/zh-CN/extending-doris/spark-doris-connector.md

@@ -28,6 +28,8 @@ under the License.
 
 Spark Doris Connector 可以支持通过 Spark 读取 Doris 中存储的数据，也支持通过Spark写入数据到Doris。
 
+代码库地址：https://github.com/apache/incubator-doris-connectors
+
 - 支持从`Doris`中读取数据
 - 支持`Spark DataFrame`批量/流式 写入`Doris`
 - 可以将`Doris`表映射为`DataFrame`或者`RDD`，推荐使用`DataFrame`。