Remove Snapshot and Splash Screen from consecutive entry check

It is already possible to ignore windows/layers on the verification of  visibleWindowsShownMoreThanOneConsecutiveEntry and visibleLayersShownMoreThanOneConsecutiveEntry. However many tests need to manually add the Snapshot and Splash Screen entries.

Those entries are not guaranteed to show for more than 1 entry, they depend on the app behavior and when the SF actually renders the information sent by WM.

This CL removes those windows by default from the verification and refactor the tests to make it easier to update in the future

Test: atest FlickerTests WMShellFlickerTests
Bug: 182720234
Change-Id: I0e3346e078515b3e9a2065256ac04696acfa59fb