Option to use build_for_testing to prepare UITests builds

Is there any option to build `*Test-Runner.app` for `ios_ui_test` target for device? Currently when trying to build `ios_ui_test` target as a result you will get `*.ipa` file of main application + `*Tests.zip` archive containing only `*Tests.xctest` file.

There is an option to get `*Test-Runner.app` using xcodeproj generated with `rules_xcodeproj`. When building test target with Xcode for testing or using `xcodebuild build_for_testing` `*Test-Runner.app` is actually built. But there is a problem that it is building always for simulator. Test target generated with `rules_xcodeproj` supports only simulator. When building it is always creating `*Test-Runner.app` for simulator even when main app target is built for device.

Start by comparing the ios_ui_test build output with Xcode's build_for_testing behavior and the rules_xcodeproj-generated test target. Done means a device build produces the *Test-Runner.app alongside the application IPA and test archive, rather than only a simulator runner.

Written by the indexing model from the issue text.