Upgrade example app to 0.62.0-rc.3

Summary:
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1. Remove entire `react-native/ReactNativeExampleFlipper` folder
2. Run `npx react-native init --version 0.62.0-rc.3 ReactNativeExampleFlipper`
4. restore the `package.json` and `TicTacToe` file and import
5. removed `.eslintrc`, `_BUCK` and `build_defz.bzl`, `.watchmenconfig`

Added comments below to highlight the non-generated changes

Reviewed By: passy

Differential Revision: D20221558

fbshipit-source-id: da1c895a2b0e7ce48092e64cdb5ffdb9e4a1a10b

react-native/react-native-flipper/react-native.config.js

@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+module.exports = {
+  dependency: {
+    platforms: {
+      ios: {
+        // This file should not be needed at all, but without it.
+        // cli 4.2.2 will search for an xcode project
+        project: '.',
+      },
+    },
+  },
+};