Merge changes from topic "backport-connectivityresources"

* changes:
  Use module resources in NetworkNotificationManager.
  Cherry-pick some test changes from ag/13210542.
  Add connectivity protos to framework-connectivity
  Remove unused NetworkPolicyManagerInternal in CS
  Move connectivity AIDLs to android.net
  Migrate framework-connectivity internal resources
  Expose isUidNetworkingBlocked and isUidRestrictedOnMeteredNetworks
  Add multipath preference, background status API