Test flake for protocol check

[botengyao]

[ RUN      ] DownstreamProtocols/ProtocolIntegrationTest.LargeRequestMethod/IPv4_Http3Downstream_HttpUpstreamBalsaParserNghttp2NoDeferredProcessing
test/integration/protocol_integration_test.cc:2421: Failure
Expected equality of these values:
  "400"
    Which is: 0x261fb2
  response->headers().getStatusValue()
    Which is: "503"
Stack trace:
  0xbb43be: Envoy::ProtocolIntegrationTest_LargeRequestMethod_Test::TestBody()
  0x1feaccc: testing::internal::HandleExceptionsInMethodIfSupported<>()
  0x1feab8d: testing::Test::Run()
  0x1febda7: testing::TestInfo::Run()
... Google Test internal frames ...

[external/com_google_absl/absl/flags/internal/flag.cc : 115] RAW: Restore saved value of envoy_reloadable_features_runtime_initialized to: false
[external/com_google_absl/absl/flags/internal/flag.cc : 115] RAW: Restore saved value of envoy_reloadable_features_no_extension_lookup_by_name to: true
[external/com_google_absl/absl/flags/internal/flag.cc : 115] RAW: Restore saved value of envoy_reloadable_features_http1_use_balsa_parser to: true
[external/com_google_absl/absl/flags/internal/flag.cc : 115] RAW: Restore saved value of envoy_reloadable_features_http2_use_oghttp2 to: false
[external/com_google_absl/absl/flags/internal/flag.cc : 115] RAW: Restore saved value of envoy_reloadable_features_defer_processing_backedup_streams to: false
[  FAILED  ] DownstreamProtocols/ProtocolIntegrationTest.LargeRequestMethod/IPv4_Http3Downstream_HttpUpstreamBalsaParserNghttp2NoDeferredProcessing, where GetParam() = 24-byte object <00-00 00-00 02-00 00-00 00-00 00-00 01-00 00-00 00-00 00-00 00-00 00-00> (80 ms)

This test is flaky.

//test/integration:quic_protocol_integration_test                        FAILED in 1 out of 16 in 94.2s

CI and local build succeeds/fails

https://source.cloud.google.com/results/invocations/bc6a9fd2-ed10-42f3-9c03-477ccffae674/targets/%2F%2Ftest%2Fintegration:quic_protocol_integration_test/tests

[botengyao]

cc @bencebeky

[botengyao]

Close in favor of #29616