Progress notification for interactive bugreports

Send instant progress notification for interactive bugreports (when
using bugreport API), starting notification when progress = 0

Bug: 123617758

Test: * Build and flash to the device
      * Turn on use bugreport API feature flag from Settings
      * Take interactive bugreport
      Expectation: Progress notification is shown instantly

Change-Id: Icd834c05324108430ee6cb9c3d8539f91059e563