Delete/restore bundle channels on classification permissions change

This change marks all bundle channels as deleted when a bundle type is disabled, and re-enables any formerly existing bundle channels if a bundle type is re-enabled.

Also removes the un-deletion of channels on restore, which is no longer needed (and, now that channel deletion should mirror enbaled types, incorrect)

Flag: android.service.notification.notification_classification
Bug: 380288703
Test: NotificationManagerServiceTest, PreferencesHelperTest

Change-Id: Iff8e790df0c8b012408e73c3cd42da3ed066782f