message: Fix 0-RTT happy eyeballs unit test
  Summary: the timer may fire during handshake, which makes the test flaky
diff: @@ -4724,6 +4724,8 @@ TEST_F(
  EXPECT_EQ(conn.peerAddress, firstAddress);
  EXPECT_EQ(conn.happyEyeballsState.secondPeerAddress, secondAddress);
  EXPECT_TRUE(client->happyEyeballsConnAttemptDelayTimeout().isScheduled());
  + // Cancel the delay timer because we want to manually fire it
  + client->happyEyeballsConnAttemptDelayTimeout().cancelTimeout();
  auto streamId = client->createBidirectionalStream().value();
  client->writeChain(streamId, IOBuf::copyBuffer("hello"), true, false);
  @@ -4734,7 +4736,6 @@ TEST_F(
  // Manually expire conn attempt timeout
  EXPECT_FALSE(conn.happyEyeballsState.shouldWriteToSecondSocket);
  - client->happyEyeballsConnAttemptDelayTimeout().cancelTimeout();
  client->happyEyeballsConnAttemptDelayTimeout().timeoutExpired();
  EXPECT_TRUE(conn.happyEyeballsState.shouldWriteToSecondSocket);
  EXPECT_FALSE(client->happyEyeballsConnAttemptDelayTimeout().isScheduled());
  