Fix BugreportReceiverTest

- Implements a local binder and #onBind in the service to return the
  service instance.
- Mocks BugreportManager in the service to avoid service interacting
  with the dumpstate.
- Fixes dialog name field did not disable after service is finished.
- Fixes screenshot did not remove if the name is empty.
- Extends screenshot delay timeout in tests.
- Fine tune the UiBot to fit new bugreport notification.
- Removes obsolete cases in the tests.

Bug: 143130523
Test: atest BugreportReceiverTest
Change-Id: Iae89206da1d08a10891503869bbbf1ce18d4e31f