message: Replace the last crypto::tink::util::error::INTERNAL usages with its absl version absl::StatusCode::kInternal.
  This CL is a part of Tink migration to using absl::Status{,Or} and absl::StatusCode.
diff: @@ -201,14 +201,13 @@ Status CliUtil::InitGcp() {
  "/tink_base/testdata/credential.json";
  auto client_result = GcpKmsClient::New("", creds_file);
  if (!client_result.ok()) {
  - return Status(crypto::tink::util::error::INTERNAL,
  + return Status(absl::StatusCode::kInternal,
  "Failed to connect to GCP client.");
  }
  auto client_add_result =
  KmsClients::Add(std::move(client_result.ValueOrDie()));
  if (!client_add_result.ok()) {
  - return Status(crypto::tink::util::error::INTERNAL,
  - "Failed to add KMS client.");
  + return Status(absl::StatusCode::kInternal, "Failed to add KMS client.");
  }
  return crypto::tink::util::OkStatus();
  }
  