Add Bubble as an option in NotificationInfo longpress menu

- If the content is able to bubble, the bubble option will show in
  the menu
- If that notif is able to bubble (either via bubble metadata or via
  notification contents), then show the menu
- Adds tests for the bubble menu option, also tests selection for alert
  and silence buttons; removes unused test code

Test: atest NotificationInfoTest NotificationGutsManagerTest
Test: manual - post a bubble with bubbles test app, longpress on notif
               and demote it via menu => bubble is gone
             - long press on notif and promote it via menu => bubble is
               created
Bug: 138116133
Bug: 143173197
Change-Id: I2f2767ec12c49e5d3a8d2a7b86db5457d062275c