Add UiEvents for blocked full-screen intents

We recently started blocking full-screen intents in a couple of edge
cases. We'd like to know how often these edge cases are being hit in the
context of UI metrics, so add UiEvents for them.

Bug: 245356701
Test: atest NotificationInterruptStateProviderImplTest
Change-Id: I559d2538a189031b69f90411b3ad810b69583ae3