Add nightly builds to run test for Android and iOS targets

While Android testrunner is using tools from QtTools, it is configured
as revdep stage. CI builds QtTools with its dependencies and let the
testrunner script to take care of building the tests. Currently dev and
release branches are configured to use same Android device, while there
is only two of those configured to be used. Once we get more, re-configure
the dev or release to use different one.

iOS is using ios-sim to launch test on iPhone simulator.

Task-number: QTQAINFRA-641
Task-number: QTQAINFRA-654
Change-Id: Ic6ecdbba2c269d44f513b9f0978b16e0cd9e2983
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>