Add CI check that builds with latest Expo

[stevehanson]

This PR updates CI to build and run the full CLI to create an app against the latest version of Expo. The test then cds into the new app and runs the tests and linters in the new app to verify the new app is valid.

This addresses two shortcomings of the current approach and test coverage:

1. When the CLI creates a new app, we always use the latest create-expo-app or react-native init command. This lowers the maintenance burden of this library and ensures users always get the latest versions of RN or Expo. But it is a bit brittle, since a new RN or Expo version might potentially break the CLI. These tests provide a way to ensure the CLI still works. Eventually, I'd like to set this up to run automatically on a cadence (eg. daily). This way, we would know quickly if a new version breaks the CLI.
2. Our current test suite does not actually run the RN or Expo CLI commands, so this provides more of an end-to-end approach