Add screenrecord/demote TwoPanelWokrspaceTest

Flag: TEST_ONLY
Test: TaplTwoPanelWorkspaceTest#testEmptyPageDoesNotGetRemovedIfPagePairIsNotEmpty
Bug: 329935119
Change-Id: I6faa8f35a2e0cd8a02d615a329baab045235ec82
1 file changed