Add more tests for ActivityPub controllers (#13585)

app/controllers/accounts_controller.rb

app/controllers/activitypub/collections_controller.rb

app/controllers/activitypub/outboxes_controller.rb

app/controllers/activitypub/replies_controller.rb

app/controllers/api/v1/polls/votes_controller.rb

app/controllers/api/v1/polls_controller.rb

app/controllers/api/v1/push/subscriptions_controller.rb

app/controllers/api/v1/statuses/mutes_controller.rb

app/controllers/api/v1/statuses_controller.rb

app/controllers/media_controller.rb

app/controllers/remote_interaction_controller.rb

app/controllers/statuses_controller.rb

app/models/status.rb

spec/controllers/activitypub/collections_controller_spec.rb

spec/controllers/activitypub/inboxes_controller_spec.rb

spec/controllers/activitypub/outboxes_controller_spec.rb

spec/controllers/activitypub/replies_controller_spec.rb

spec/controllers/statuses_controller_spec.rb

spec/fabricators/status_pin_fabricator.rb