Fix bubbles for workprofile

- use getPackageManagerForUser when looking up app info
- add test for it

Bug: 184041127
Test: atest BubblesTest
Test: - have a managed work profile
      - install the bubbles app *only* for the work profile
      - make some bubbles
      => Notice bubbles appear
      - dismiss all the bubbles
      - restart the device, add a bubble
      - open the bubble, navigate to the bubble overflow
      => notice the previously dismissed workprofile bubbles
        are in the overflow
Change-Id: I479bb717b3c365346682331b0def7170ed1a791b