Filter out WmShellFlickerTests that are not supported on TV

By default all new WmShellFlickerTests are enabled on TV even despite
the fact that most of them focus the features that are not supported on
TV, and never been run on TV devices prior to adding. Some examples are:
com.android.wm.shell.flicker.apppairs.AppPairsTest
com.android.wm.shell.flicker.splitscreen.*
com.android.wm.shell.flicker.legacysplitscreen.*
To address this we move from "opt-out" to "opt-in" model for
WmShellFlickerTests on TV.

Bug: 176074784
Test: run `atest WMShellFlickerTests` on ADT-3
Change-Id: Ic71f9ed4cd0f3b13d81763b2741e827f32b26c4a