Prevent infinite loops in QUIC e2e test In some failure cases, our e2e test could get itself into an infinite loop, causing it to wait 5 minutes for the overall test timeout. That makes debugging incredibly painful. This CL tweaks our code to fail earlier allowing us to avoid more timeouts. Test-only change PiperOrigin-RevId: 319314922 Change-Id: Ibe90e26500db95201818c6a40c5b819d3c44cae8