random_parcel: don't always make a parcel view when filling a random parcel

RandomParcelOptions needs to outlive the parcel because it is holding
the reference to the parcel that the view represents. Right now, this
isn't always the case.
This CL introduces a way to declare when views are OK to create.

Flag: TEST_ONLY
Test: servicemanager_fuzzer
Bug: 421008884
Change-Id: Iee0e24a50e2ac7dcedc11d47b6a9678fd5220817