The subtitle for the apps page says which apps (up to two/three) and how
many (if there are more than three) are allowed to bypass dnd under the
main "Apps" page.
Bug: 308819928
Test: atest ZenModesSummaryHelperTest
Flag: android.app.modes_ui
Change-Id: I15696384c392ba3f054948db50eea614f91d8c48
Adds the settings page that a user will reach from a mode settings page
when they tap on "App," to allow them to select whether all, none, or
priority modes can break through and send notifications.
Bug: 308819928
Bug: 331267485
Flag: android.app.modes_ui DEVELOPMENT
Test: build and test, controller unit tests
Change-Id: I5bcebfca0fc2882f839afdced8d2b817dad14e6c
Also fixed a handful of style issues / warnings along the way.
Fixes: 341950853
Fixes: 341910620
Test: atest com.android.settings.notification.modes
Flag: android.app.modes_ui
Change-Id: I65900941fcdf53824caf052fd0a24401c1bfb476