message: test: fix config test to not assert/crash when there is an invalid config
diff: @@ -33,7 +33,7 @@ public:
  try {
  main_config.initialize(*config_json);
  } catch (const EnvoyException& ex) {
  - throw EnvoyException(fmt::format("'{}' config failed. Error: {}", file_path, ex.what()));
  + ADD_FAILURE() << fmt::format("'{}' config failed. Error: {}", file_path, ex.what());
  }
  server_.thread_local_.shutdownThread();
  