Add a babblesim test of the BT Tester doing a GAP smoke test
connecting 2 BT testers using BTP.
The purpose of this is to further increase the test coverage
of the BT Tester in CI, as it is only being built, and runtime
errors are typically not caught.
Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
