tests/xdgshellclient_rules: Add tests for screen rules

There are two operations failing currently, so we QEXPECT_FAIL
them for now:
- A new client is not moved to the screen set by the rule
   (Wayland only). Affects Apply, Force and Remember
- Disabling and enabling an output will not move the client
   to the Forced screen (On X11 and Wayland, BUG:409979)