Wipe the LUKS header when deleting a persistent volume
Tails::Persistence::Setup::delete_persistence_partition, we should
make sure that the LUKS header is wiped (that is, at least overwritten
once with zeroes) to make further forensics more difficult. It might be
that UDisks does it already, so we should check that first. It might be
that UDisks and UDisks2 behave differently in this area, so this should
be checked too.
- Related to #8291 (closed)