Add tests for guest user metrics

Test: statsd_testdrive -terse 90
Test: atest SystemUITests:com.android.systemui.qs.tiles.UserDetailViewAdapterTest
Test: atest SystemUITests:com.android.systemui.statusbar.policy.UserSwitcherControllerTest

Bug: 169783558
Bug: 194441567
Change-Id: I009fc0eba32e34cb62f2cc15f9337bce9b81c89d
Merged-In: I009fc0eba32e34cb62f2cc15f9337bce9b81c89d