Implement recents activity for Go for when the default launcher does not
have recents implemented. To do this, we factor out some common recents
activity functionality from RecentsActivity and extend it to make a Go
specific activity that pops in the icon recents fragment.
Bug: 114136250
Test: Manual test NexusLauncher and Launcher3QuickstepGo by installing a
quickstep-less launcher and setting it to default
Change-Id: I936568489e8966da4a62e4b779ae660a220f2aeb
Kevin
750bbe08da