Created by: robbertvanginkel
apple_test targets have a test_host if the tests test an application, used to set the -bundle_loader argument during linking to provide the test bundle with the symbols that would be available when the test bundle gets injected into the app.
With #1505, I introduced a change that when a test target is marked as is_ui_test, it would not set this bundle loader flag. This is because XCUITests don't run injected into the app, but in a separate process. The implementation in that PR made sure the test_host_app wouldn't be passed when creating a test target, having the unintended side effect of removing the runtime dependency of test host app. This resulted in the test host app not being build when doing buck build //test:target.
This PR changes it so that the TestHostInfo can be created and passes the test_host_app. This way the runtime dependency stays in place while the host app is not used as bundle_loader.