[test] Unstable test Flink118TableSourceBatchITCase.testCountPushDownForLogTable

https://github.com/apache/fluss/actions/runs/31059083892/job/92482828634

```
[ERROR] org.apache.fluss.flink.source.Flink118TableSourceBatchITCase.testCountPushDownForLogTable(boolean)[2] Time elapsed: 14.141 s <<< ERROR!
java.lang.RuntimeException: Unexpected error after waiting 2630 ms for Flink job results. Expected 1 records but got 0 before error occurred.
at org.apache.fluss.flink.source.testutils.FlinkRowAssertionsUtils.collectRowsWithTimeout(FlinkRowAssertionsUtils.java:169)
at org.apache.fluss.flink.source.testutils.FlinkRowAssertionsUtils.collectRowsWithTimeout(FlinkRowAssertionsUtils.java:105)
at org.apache.fluss.flink.source.testutils.FlinkRowAssertionsUtils.collectRowsWithTimeout(FlinkRowAssertionsUtils.java:93)
at org.apache.fluss.flink.source.FlinkTableSourceBatchITCase.testCountPushDownForLogTable(FlinkTableSourceBatchITCase.java:647)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:727)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:156)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:147)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestTemplateMethod(TimeoutExtension.java:94)
at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(InterceptingExecutableInvoker.java:103)
at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.lambda$invoke$0(InterceptingExecutableInvoker.java:93)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:92)
at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:86)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:217)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:213)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:138)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:151)
... (truncated)
```

Start with FlinkTableSourceBatchITCase.java at testCountPushDownForLogTable around line 647, then inspect FlinkRowAssertionsUtils.collectRowsWithTimeout at the reported lines. Run the affected integration test repeatedly and trace why it sometimes returns zero records. Done means the test consistently receives the expected one record without timeout errors.

Written by the indexing model from the issue text.