Apply dynamic deny list into data usage state

 - Initiate and sync existing network policy when creating the instance
 - Imple a method to suggest list of packages to set as POLICY_REJECT
 - Reset/clear the policy settings once clear storage or reset
   preference

Bug: 306329984
Test: make SettingsRoboTests
Change-Id: I10ba28fee08c29bc2092820fbc8d8ac0e61d30e7