filter unlisted content + make sure to filter future scheduled

[tzarebczan]

• [ ] Unlisted content will have this tag: c:unlisted. Add to not tags
• [ ] verify that claim searches do a release time < now()

[ktprograms]

@tzarebczan For lighthouse searches it isn't possible to restrict release time < now, right?

[tzarebczan]

there isn't but I'll work on the lighthouse changes to not return these at all this week.