Summary:
This PRs makes an attempt at fixing the set up of the Android end to end tests, and the tests themselves. The end goal is to re-enable the tests on CircleCI (see #23561 for more details).
The goal of this PR is to the end to end tests to a working state. Better tests can be added at a later point.
I changed the tests using the menu button. These tests made something silently crash/hang, after which it was no longer possible to get an element or even get the source. A fix for this needs further investigation.
Also, I enabled the tests in the CircleCI config, however CircleCI is currently failing on them with the following error:
```
info Running /opt/android/platform-tools/adb -s emulator-5554 reverse tcp:8081 tcp:8081
error: closed
info Could not run adb reverse: Command failed: /opt/android/platform-tools/adb -s emulator-5554 reverse tcp:8081 tcp:8081
info Starting the app on emulator-5554 (/opt/android/platform-tools/adb -s emulator-5554 shell am start -n com.endtoendtest/com.endtoendtest.MainActivity)...
Starting: Intent { cmp=com.endtoendtest/.MainActivity }
Too long with no output (exceeded 10m0s)
```
Some help here would be appreciated. An alternative is to not enable the tests yet on CircleCI in this PR.
[Android] [fixed] - Fix and update end to end tests for Android
Pull Request resolved: https://github.com/facebook/react-native/pull/23958
Differential Revision: D14502884
Pulled By: hramos
fbshipit-source-id: 4316c3fd817451d332e64a10d88389b74a60d3dd
bce1e6f536