Add support for private pinned posts (#16954)

* Add support for private pinned toots

* Allow local user to pin private toots

* Change wording to avoid "direct message"

app/workers/remote_account_refresh_worker.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class RemoteAccountRefreshWorker
+  include Sidekiq::Worker
+  include ExponentialBackoff
+  include JsonLdHelper
+
+  sidekiq_options queue: 'pull', retry: 3
+
+  def perform(id)
+    account = Account.find_by(id: id)
+    return if account.nil? || account.local?
+
+    ActivityPub::FetchRemoteAccountService.new.call(account.uri)
+  rescue Mastodon::UnexpectedResponseError => e
+    response = e.response
+
+    if response_error_unsalvageable?(response)
+      # Give up
+    else
+      raise e
+    end
+  end
+end