Change Settings controllers & pages to for per-user bundle settings

This change maintains existing UI and does not (yet) add new settings to actually adjust the preferences for managed profiles; but the existing switches as well as relevant NotificationBackend methods are updated to have the correct functionality for what they're meant to do.

Flag: android.app.notification_classification_ui
Bug: 380290891
Test: AdjustmentExcludedAppsPreferenceControllerTest, BundleCombinedPreferenceControllerTest, SummarizationGlobalPreferenceControllerTest, SummarizationPreferenceControllerTest, AdjustmentKeyPreferenceControllerTest, BundlePreferenceControllerTest

Change-Id: I23e8f3fd81414b8783aa3a9262f9d4bb57ad0287