Reimplement e2e for new posts for the composer screen
Summary
Refactor /e2e/posts.spect.js to /e2e/posts.e2e.js
- Use device.reloadReactNative instead of app launch in the beforeEach callback (faster)
- Use the login action
- Create tests for: Text only post, NSFW with text, attached image post, check more variants needed (we should test all the composer features)