Refactor UBMS to use LifecycleOperationStorage.

Several other related classes are also updated to have a
dependency on OperationStorage, which removes a number of
tight bindings on UserBackupManagerService.

BUG: 161089758
Test: atest BackupFrameworksServicesRoboTests
      atest CtsBackupHostTestCases
      atest CtsBackupTestCases
      atest GtsBackupTestCases
Change-Id: I644ef2cd1a3e8d8c35a269c140df8cc5f3654e16