Add test cases for highlight Preference click behavior

On large screen Activity embedding devices, Settings homepage
shows a highlighted Preference which is mapped to current
right pane.

For better UX, when users click again on a highlighted Preference,
it should not launch SubSettings.

Fix: 236275503
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.dashboard.DashboardFeatureProviderImplTest
Change-Id: I222c9b015fb090f359c3c9f4187823477920715b