[Improvement] optimize TestUtils.httpGet in ShuffleServerGrpcTest.sendDataAndRequireBufferTest()

[lifeSo]

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What would you like to be improved?

optimize TestUtils.httpGet in ShuffleServerGrpcTest.sendDataAndRequireBufferTest()

https://github.com/apache/incubator-uniffle/pull/1425#discussion_r1444150953

How should we improve?

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Are you willing to submit PR?

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