Add service to revoke inclusion in a Collection (#38026)

app/serializers/activitypub/delete_feature_authorization_serializer.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class ActivityPub::DeleteFeatureAuthorizationSerializer < ActivityPub::Serializer
+  include RoutingHelper
+
+  attributes :id, :type, :actor, :to
+
+  has_one :object, serializer: ActivityPub::FeatureAuthorizationSerializer
+
+  def id
+    [ap_account_feature_authorization_url(object.account_id, object), '#delete'].join
+  end
+
+  def type
+    'Delete'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+
+  def to
+    [ActivityPub::TagManager::COLLECTIONS[:public]]
+  end
+end