Add remote only to public timeline (#13504)

app/controllers/api/v1/timelines/public_controller.rb

app/javascript/mastodon/actions/streaming.js

app/javascript/mastodon/actions/timelines.js

...on/features/public_timeline/components/column_settings.js

...s/public_timeline/containers/column_settings_container.js

app/javascript/mastodon/features/public_timeline/index.js

...avascript/mastodon/features/ui/components/columns_area.js

app/models/status.rb

spec/models/status_spec.rb

streaming/index.js