Remove embedded & document launch always restrictions from a bubble

* No longer need the embedded flag as of ag/9341444
* Instead of requiring the app to specify documentLaunchMode=always we'll
  apply the relevant intent flags to force that behaviour; this CL
  updates bubble related tests to no longer specify documentLaunchMode or
  embedded
* Adds CTS to ensure that an activity in a bubble has the appropriate
  flags on the intent

Test: atest NotificationManagerTest
Test: manual - check that CTSVerifierApp still produces bubbles & runs
      through the steps correctly
Bug: 138325285
Change-Id: I87ac01139e19e05b6c8caaee166c7ea954ee2592
7 files changed