Maintenance: Improve handling of Zendesk API hickups/temporary errors.

lib/sequencer/unit/import/zendesk/sub_sequence/base.rb

@@ -41,10 +41,13 @@ class Sequencer
             def resource_iteration(&block)
               resource_collection.public_send(resource_iteration_method, &block)
             rescue ZendeskAPI::Error::NetworkError => e
-              case e.response.status.to_s
-              when '403'
-                return if resource_klass.in?(%w[UserField OrganizationField])
-              when /^5\d\d$/
+              status = e.response.status.to_s
+
+              if status.match?(/^(4|5)\d\d$/)
+
+                # #2262 Zendesk-Import fails for User & Organizations when 403 "access" denied
+                return if status == '403' && resource_klass.in?(%w[UserField OrganizationField])
+
                 raise if (fail_count ||= 1) > 10
 
                 logger.error e