Work around flaky java http client http/2 tests #13958
Merged
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Previously we disabled java http client http/2 tests on java 25 because they were too flaky and caused occasional build failures. While not as flaky as on java 25 the tests are still flaky on java 21+ (didn't see failures on earlier versions, but perhaps didn't look hard enough). I have a hypothesis that the failure stems from the server responding and reseting the stream when the client believes that it hasn't yet completely sent the request body. Which is weird, because the test harness sends an empty request body. With local testing the tests didn't fail any more with the added delay.