Fix Flaky test GetShuffleReportForMultiPartTest

[leixm]

What changes were proposed in this pull request?

org.opentest4j.AssertionFailedError: expected: <0> but was: <-218>
	at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
	at org.junit.jupiter.api.AssertionUtils.failNotEqual(AssertionUtils.java:62)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:150)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:145)
	at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:527)
	at org.apache.uniffle.test.GetShuffleReportForMultiPartTest.validateRequestCount(GetShuffleReportForMultiPartTest.java:198)
	at org.apache.uniffle.test.GetShuffleReportForMultiPartTest.runTest(GetShuffleReportForMultiPartTest.java:185)
	at org.apache.uniffle.test.SparkIntegrationTestBase.runSparkApp(SparkIntegrationTestBase.java:74)
	at org.apache.uniffle.test.SparkIntegrationTestBase.run(SparkIntegrationTestBase.java:59)
	at org.apache.uniffle.test.GetShuffleReportForMultiPartTest.resultCompareTest(GetShuffleReportForMultiPartTest.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:725)
	at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
	at 

Why are the changes needed?

Fix flaky test

Does this PR introduce any user-facing change?

No

How was this patch tested?

UT passed

[codecov-commenter]

Codecov Report

Merging #241 (17ec079) into master (1b281c4) will decrease coverage by 1.21%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #241      +/-   ##
============================================
- Coverage     59.16%   57.94%   -1.22%     
+ Complexity     1332     1254      -78     
============================================
  Files           160      151       -9     
  Lines          8738     8242     -496     
  Branches        820      790      -30     
============================================
- Hits           5170     4776     -394     
+ Misses         3303     3212      -91     
+ Partials        265      254      -11     

Impacted Files	Coverage Δ
...storage/handler/impl/DataSkippableReadHandler.java	81.25% <0.00%> (-3.13%)	⬇️
.../org/apache/spark/shuffle/writer/WriterBuffer.java
.../java/org/apache/spark/shuffle/RssSparkConfig.java
...org/apache/spark/shuffle/writer/AddBlockEvent.java
...org/apache/spark/shuffle/RssSparkShuffleUtils.java
...che/spark/shuffle/writer/BufferManagerOptions.java
...k/shuffle/writer/WrappedByteArrayOutputStream.java
...pache/spark/shuffle/writer/WriteBufferManager.java
...e/spark/shuffle/reader/RssShuffleDataIterator.java
...ava/org/apache/spark/shuffle/RssShuffleHandle.java

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[jerqi]

LGTM