message: tests: fix tsan test flake
diff: @@ -146,6 +146,14 @@ TEST_P(EdsIntegrationTest, Http2HcClusterRewarming) {
  upstream_request->encodeHeaders(Http::TestHeaderMapImpl{{":status", "503"}}, true);
  test_server_->waitForGaugeEq("cluster_manager.warming_clusters", 0);
  EXPECT_EQ(0, test_server_->gauge("cluster_manager.warming_clusters")->value());
  +
  + // Since the second connection is not managed by the integration test base we need to close it
  + // ourselves.
  + result = fake_upstream_connection->close();
  + RELEASE_ASSERT(result, result.message());
  + result = fake_upstream_connection->waitForDisconnect();
  + RELEASE_ASSERT(result, result.message());
  + fake_upstream_connection.reset();
  }
  // Verify that a host stabilized via active health checking which is first removed from EDS and
  