Replace mocked loggers by real ones in SystemUI tests

These loggers are now backed up by Logcat-based LogBuffers. As such, we can extract the logs they produce for help in debugging tests (and the Loggers themselves are also exercised). In some cases, wherever we were verify()-ing logger calls, we use spies.

Replaced (hopefully) everything under systemui/statusbar/notification/ plus some other tests under systemui/ that looked notification-y.

Fixes: 293611249
Test: atest
Change-Id: Ie384508d0ab7eb9545adeaf78914fd8fac1bfbb1