Add example working UI test

[keith]

The key here is the module_name of the test source lib is the same as the test name so the ProductModuleName in the xctestrun file matches the module name

[lyft-lint-bot]

Lyft integration job started: https://buildkite.com/lyft/rules-apple/builds/414 (must be Lyft employee to view)

[keith]

we don't really have to merge, we'll see, either way it's an example of a working option for the linked bug report

[brentleyjones]

We might as well have a checked in example.

[keith]

https://github.com/bazelbuild/rules_apple/pull/1909#issuecomment-1474037323