Fix launching bubbles from widgets

There were a couple of issues:
1) onActivityRestart wasn't checking for bubbles in the overflow
   so there were cases where we could open a bubble but weren't
2) delay opening the bubble until after the transitions have
   happened when launching from a widget, the transition could
   alter the placement of the bubble's surface resulting in
   weird UI.

Test: atest LaunchConversationActivityTest
Test: manual 1) have a bubble & convo widget for it
             2) tap on the widget => bubble opens normally, close
                the bubble & repeat that a bunch

             1) have an unopened bubble & convo widget for it
             2) get enough bubbles to push it out of the stack &
                out of the overflow
             3) tap on the widget => bubble opens

             1) have a bubble & convo widget for it, dismiss bubble
             2) tap on the widget => bubble opens normally
Bug: 188306336

Change-Id: Id68ccbfbfc6fc6949cfc257df4706b470fb78569