Fix TwoPanelWorkspaceTests

- Marking the hotseat long press edu as seen on setup to allow the popup menu to be shown immediately in tests
- Recording onWorkspaceItemLongClick on prediction item long click

Flag: not needed
Fixes: 273239675
Test: TwoPanelWorkspaceTest
Change-Id: I76354fd2e3adde11b2a428374fa9c8855ce2ece9