Generalize package uninstall receiver for other storages

Refactor PersistedStoragePackageUninstalledReceiver to run over all
storages instead of just permission decisions. To support testing, we
pass in the dispatcher and also generalize the test storage class
(as mocking/verifying classes with suspend behavior is unsupported).

Bug: 205642821
Test: atest PersistedStoragePackageUninstalledReceiverTest
Change-Id: I5dcea3b84fc873c7e33f487126e032585a3a5f38