Add script to run mocha-remote and metro alone

Author: kraenhansen

apps/test-app/package.json

@@ -7,6 +7,7 @@
     "android": "react-native run-android --no-packager --active-arch-only",
     "ios": "react-native run-ios --no-packager",
     "pod-install": "cd ios && pod install",
+    "mocha-and-metro": "mocha-remote --exit-on-error -- node --run metro",
     "test:android": "mocha-remote --exit-on-error -- concurrently --kill-others-on-fail --passthrough-arguments npm:metro 'npm:android -- {@}' --",
     "test:android:allTests": "MOCHA_REMOTE_CONTEXT=allTests node --run test:android -- ",
     "test:android:nodeAddonExamples": "MOCHA_REMOTE_CONTEXT=nodeAddonExamples node --run test:android -- ",