[Bug] Tests are blocked on "FlussClusterExtension#waitUtilAllGatewayHasSameMetadata"

### Search before asking

- [X] I searched in the [issues](https://github.com/alibaba/fluss/issues) and found nothing similar.

### Fluss version

main

### Minimal reproduce step

https://github.com/alibaba/fluss/actions/runs/12344564548/job/34447289105

```
Error: Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 617.875 s <<< FAILURE! - in com.alibaba.fluss.server.coordinator.StopReplicaITCase
Error: com.alibaba.fluss.server.coordinator.StopReplicaITCase Time elapsed: 617.875 s <<< FAILURE!
java.lang.AssertionError: Attempt failed.
at com.alibaba.fluss.testutils.common.CommonTestUtils.retry(CommonTestUtils.java:156)
at com.alibaba.fluss.server.testutils.FlussClusterExtension.waitUtilAllGatewayHasSameMetadata(FlussClusterExtension.java:361)
at com.alibaba.fluss.server.testutils.FlussClusterExtension.start(FlussClusterExtension.java:177)
at com.alibaba.fluss.server.testutils.FlussClusterExtension.beforeAll(FlussClusterExtension.java:123)
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeBeforeAllCallbacks$12(ClassBasedTestDescriptor.java:395)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeBeforeAllCallbacks(ClassBasedTestDescriptor.java:395)
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.before(ClassBasedTestDescriptor.java:211)
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.before(ClassBasedTestDescriptor.java:84)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:148)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
at org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService$ExclusiveTask.compute(ForkJoinPoolHierarchicalTestExecutorService.java:185)
at org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService.invokeAll(ForkJoinPoolHierarchicalTestExecutorService.java:129)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
at org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService$ExclusiveTask.compute(ForkJoinPoolHierarchicalTestExecutorService.java:185)
at java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:189)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:[1692](https://github.com/alibaba/fluss/actions/runs/12344564548/job/34447289105#step:3:1693))
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175)
Caused by: java.util.concurrent.ExecutionException: com.alibaba.fluss.exception.NetworkException: Disconnected from node 127.0.0.1:34201 (id: ts-0)
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1908)
at com.alibaba.fluss.server.testutils.FlussClusterExtension.lambda$waitUtilAllGatewayHasSameMetadata$5(FlussClusterExtension.java:364)
at com.alibaba.fluss.testutils.common.CommonTestUtils.retry(CommonTestUtils.java:141)
... 32 more
Caused by: com.alibaba.fluss.exception.NetworkException: Disconnected from node 127.0.0.1:34201 (id: ts-0)
Caused by: java.nio.channels.ClosedChannelException
at com.alibaba.fluss.rpc.netty.client.NettyClientHandler.channelInactive(NettyClientHandler.java:158)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:305)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:281)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:274)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:81)
at com.alibaba.fluss.shaded.netty4.io.netty.handler.timeout.IdleStateHandler.channelInactive(IdleStateHandler.java:277)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:303)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:281)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:274)
at com.alibaba.fluss.shaded.netty4.io.netty.handler.codec.ByteToMessageDecoder.channelInputClosed(ByteToMessageDecoder.java:411)
at com.alibaba.fluss.shaded.netty4.io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:376)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:305)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:281)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:274)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.DefaultChannelPipeline$HeadContext.channelInactive(DefaultChannelPipeline.java:1405)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:301)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:281)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:901)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:813)
at com.alibaba.fluss.shaded.netty4.io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173)
at com.alibaba.fluss.shaded.netty4.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166)
at com.alibaba.fluss.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
at com.alibaba.fluss.shaded.netty4.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569)
at com.alibaba.fluss.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
at com.alibaba.fluss.shaded.netty4.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at com.alibaba.fluss.shaded.netty4.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:750)

[INFO]
[INFO] Results:
[INFO]
Error: Failures:
Error: StopReplicaITCase Attempt failed.
[INFO]
Error: Tests run: 39, Failures: 1, Errors: 0, Skipped: 0
```

### What doesn't meet your expectations?

Tests are unstable

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start with FlussClusterExtension.start and waitUtilAllGatewayHasSameMetadata, then inspect StopReplicaITCase and CommonTestUtils.retry around the reported failure. Trace the disconnected node through NettyClientHandler and reproduce the instability using the linked GitHub Actions run. Done means the integration test no longer blocks or fails intermittently while waiting for gateway metadata.

Written by the indexing model from the issue text.