Include and run upstream rntester-e2e tests in our repo

Summary

We already have our own version of the upstream rn-tester package in the form of @react-native/tester with our overrides and our own @react-native-windows/tester with additional Windows examples/pages, and finally our own e2e-test-app for running XAML snapshot tests with wdio/WinAppDriver.

However, upstream RN also has an rn-tester-e2e package which contains a suite of jest tests against the rn-tester app using wido targeting ios and android platforms. We should bring and adapt the upstream rn-tester-e2e package into our repo so we can also run those E2E jest tests but targeting windows instead.

Motivation

We already know how to run wido tests against our e2e-test-app but right now it's only for XAML snapshot testing. If there is a suite of wido tests upstream, already written, it seems like we could greatly expand our test coverage for pretty cheap, while also getting the benefits of checking our platform's behavior against the "expectation" from RN.

Basic Example

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Open Questions

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Compare the upstream rn-tester-e2e package with this repository's @react-native/tester, @react-native-windows/tester, and e2e-test-app. Start by tracing how the existing wdio/WinAppDriver tests are run, then determine how the upstream Jest suite can target Windows. Done means the adapted suite runs against the Windows tester app.