Add switch for work profile to bundled notification settings.

This change adds a work profile switch below the classification type switches and additionally separates each of the type-based switches and the work profile switch into preference categories so they don't all end up grouped together.

Bug: 412433475
Test: BundleCombinedPreferenceControllerTest, manual
Flag: android.app.notification_classification_ui
Change-Id: I8c787bbd4419ada237a42c8f01a5a5ae78d93205