Remove dumpable container from SystemUIApplication

It is not guaranteed that the dump manager is created prior to an
external process attempting to use the application as a dumpable
container. The dump manager should be used through a supplied dagger
instance instead to guarantee that it exists.

Bug: 271391142
Test: manual
Change-Id: I080c049f896c482b2da4efb4b2396afe78aa984d