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/android/build.gradle

@@ -84,10 +84,7 @@ dependencies {
     implementation 'com.facebook.soloader:soloader:0.8.2'
 
     implementation("com.facebook.flipper:flipper:${FLIPPER_VERSION}") {
-        exclude group:'com.facebook.yoga'
-        exclude group:'com.facebook.flipper', module: 'fbjni'
-        exclude group:'com.facebook.litho', module: 'litho-annotations'
-        exclude group:'com.squareup.okhttp3'
+        exclude group:'com.facebook.fbjni'
     }
 }