Override compute_target_tcp_proxies_v1::TargetTcpProxiesClient Authentication Defaults

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  [](std::string const& keyfile) {
    auto is = std::ifstream(keyfile);
    is.exceptions(std::ios::badbit);  // Minimal error handling in examples
    auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto options =
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            google::cloud::MakeServiceAccountCredentials(contents));
    return google::cloud::compute_target_tcp_proxies_v1::TargetTcpProxiesClient(
        google::cloud::ExperimentalTag{},
        google::cloud::compute_target_tcp_proxies_v1::
            MakeTargetTcpProxiesConnectionRest(google::cloud::ExperimentalTag{},
                                               options));
  }