Fix issue with severed relationships notifications (#29668)

app/models/account_relationship_severance_event.rb

@@ -16,7 +16,7 @@ class AccountRelationshipSeveranceEvent < ApplicationRecord
   belongs_to :account
   belongs_to :relationship_severance_event
 
-  delegate :severed_relationships, :type, :target_name, :purged, to: :relationship_severance_event, prefix: false
+  delegate :severed_relationships, :type, :target_name, :purged?, to: :relationship_severance_event, prefix: false
 
   before_create :set_relationships_count!
 

app/models/notification.rb

@@ -89,7 +89,7 @@ class Notification < ApplicationRecord
     belongs_to :favourite, inverse_of: :notification
     belongs_to :poll, inverse_of: false
     belongs_to :report, inverse_of: false
-    belongs_to :relationship_severance_event, inverse_of: false
+    belongs_to :account_relationship_severance_event, inverse_of: false
   end
 
   validates :type, inclusion: { in: TYPES }

app/serializers/rest/notification_serializer.rb

@@ -6,7 +6,7 @@ class REST::NotificationSerializer < ActiveModel::Serializer
   belongs_to :from_account, key: :account, serializer: REST::AccountSerializer
   belongs_to :target_status, key: :status, if: :status_type?, serializer: REST::StatusSerializer
   belongs_to :report, if: :report_type?, serializer: REST::ReportSerializer
-  belongs_to :relationship_severance_event, key: :event, if: :relationship_severance_event?, serializer: REST::AccountRelationshipSeveranceEventSerializer
+  belongs_to :account_relationship_severance_event, key: :event, if: :relationship_severance_event?, serializer: REST::AccountRelationshipSeveranceEventSerializer
 
   def id
     object.id.to_s