[bp/1.25] test: fix flaky test DownstreamProtocolIntegrationTest.HandleDownstreamSocketFail (#27546) #28013
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The test manually introduces EBADF error on the connection between Envoy and the test client. However, the IoHandleMatcher doesn't distinguish UDP socket from TCP. If the upstream HTTP/3 connection gets the same port number as downstream TCP connection, the EBADF error will be applied to the wrong connection.
Enforce IoHandleMatcher to match socket type.
Risk Level: low, test only
Testing: existing tests
Docs Changes: N/A
Release Notes: N/A
Partially Fix #27490
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