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/index.js

@@ -156,7 +156,7 @@ function printNoFlipperWarning() {
   // $FlowFixMe
   if (typeof __DEV__ !== 'undefined' && __DEV__) {
     console.warn(
-      'The native module for Flipper seems unavailable. Make sure `initializeFlipper(this, getReactNativeHost().getReactInstanceManager()` is called in MainApplication.java:onCreate, and that `react-native-flipper` is installed as yarn dependency',
+      'The native module for Flipper seems unavailable. Please verify that `react-native-flipper` is installed as yarn dependency to your project and, for iOS, that `pod install` is run in the `ios` directory.',
     );
   }
 }