Automate `gradle connectedAndroidTests`

[janpio]

This project has additional tests to the normal JS stuff in https://github.com/apache/cordova-android/tree/master/test. Two commands: gradlew test (unit tests) and gradlew connectedAndroidTest (instrumentation tests).

The unit tests are part of the CI run via https://github.com/apache/cordova-android/blob/master/test/run_java_unit_tests.js: https://github.com/apache/cordova-android/blob/ef2434188efeef868e91232188ef080acdd28e32/package.json#L21-L30

But I couldn't find anything for the connectedAndroidTest, which probably means this test is not run automatically right now.

(Both test types pass right now by the way.)