[Bug] 当load stream 连接失败时，错气信息不明确，也没打印出对应的地址，导致很难排查问题

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.

### Version

1.6.1

### What's Wrong?

简单的日志如下
2024-08-06 10:26:01
java.io.IOException: Could not perform checkpoint 5027 for operator temp.table_count: Writer (1/1)#55.
at org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:1275)
at org.apache.flink.streaming.runtime.io.checkpointing.CheckpointBarrierHandler.notifyCheckpoint(CheckpointBarrierHandler.java:147)
at org.apache.flink.streaming.runtime.io.checkpointing.CheckpointBarrierTracker.processBarrier(CheckpointBarrierTracker.java:107)
at org.apache.flink.streaming.runtime.io.checkpointing.CheckpointedInputGate.handleEvent(CheckpointedInputGate.java:181)
at org.apache.flink.streaming.runtime.io.checkpointing.CheckpointedInputGate.pollNext(CheckpointedInputGate.java:159)
at org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.emitNext(AbstractStreamTaskNetworkInput.java:118)
at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:65)
at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:562)
at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:231)
at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:858)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:807)
at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:953)
at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:932)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:746)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:562)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.doris.flink.exception.DorisRuntimeException: java.util.concurrent.ExecutionException: java.net.NoRouteToHostException: No route to host (Host unreachable)
at org.apache.doris.flink.sink.writer.DorisStreamLoad.stopLoad(DorisStreamLoad.java:263)
at org.apache.doris.flink.sink.writer.DorisWriter.prepareCommit(DorisWriter.java:249)
at org.apache.flink.streaming.runtime.operators.sink.SinkWriterOperator.emitCommittables(SinkWriterOperator.java:199)
at org.apache.flink.streaming.runtime.operators.sink.SinkWriterOperator.prepareSnapshotPreBarrier(SinkWriterOperator.java:169)
at org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.prepareSnapshotPreBarrier(RegularOperatorChain.java:89)
at org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.checkpointState(SubtaskCheckpointCoordinatorImpl.java:322)
at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$performCheckpoint$15(StreamTask.java:1318)
at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:50)
at org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:1306)
at org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:1263)
... 15 more
Caused by: java.util.concurrent.ExecutionException: java.net.NoRouteToHostException: No route to host (Host unreachable)
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at org.apache.doris.flink.sink.writer.DorisStreamLoad.stopLoad(DorisStreamLoad.java:261)
... 24 more
Caused by: java.net.NoRouteToHostException: No route to host (Host unreachable)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:607)
at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:376)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
at org.apache.doris.flink.sink.writer.DorisStreamLoad.lambda$startLoad$0(DorisStreamLoad.java:296)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
... 1 more

### What You Expected?

希望吧load 地址打印出来

### How to Reproduce?

_No response_

### Anything Else?

_No response_

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Start in DorisStreamLoad.java, focusing on the stopLoad and startLoad paths shown in the stack trace, and trace how connection failures are wrapped. Done means the load address is included in the failure log while preserving the underlying connection error.

Written by the indexing model from the issue text.