Add option to archive protest

[guytepper]

Currently, the way we remove protests is by deleting them from the collection.
It's better if we add an archived property to it instead. It'll require changes across all source code (wherever we fetch protests we need to add an archived != true condition to it.
We'll probably need to add a migration that adds the archived property to all existing protests (it'll make it easier to run conditions on the collection).

[daganomri]

I believe that in the current admin flow what you're describing already happens. You can archive an approved protest and it adds to it archived: true. All that remains is to filter it out on our api requests