remove use of folly::init (#48573)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/48573

changelog: [internal]

remove main.cpp for cxxreact/tests. It is not needed for tests to work and it breaks build for C++ only tests.

Reviewed By: javache

Differential Revision: D67975182

fbshipit-source-id: b9cbc5b5b6a87aafc69448e99877e664ed2d5af2

packages/react-native/ReactCommon/cxxreact/tests/main.cpp

@@ -1,15 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-#include <folly/init/Init.h>
-#include <gtest/gtest.h>
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  folly::init(&argc, &argv);
-  return RUN_ALL_TESTS();
-}