Add codepush for both platforms #3416

Ticket(s) / Related Merge Requests

#3416 (closed) #4232 (closed)

Summary of Changes

Added code-push support for both platforms. For now, it is using the Staging key until we define the best way to integrate it into our workflow.

Testing Considerations

• The review app will start with the bundled JS, after the first run it will download the new Staging version (give it time to download)
• After restarting the app, the updated bundle will be used (WelcomeScreen's the login button will should say login new)

Regression Scope

This can potentially break the initialization or app build. We also keep an eye on app startup performance impact

Platform Affected (web, mobile, etc)

Both

Developer Testing Completed

Tested live updates on both platforms