🤖 Add rake task to re save importers

This rake task will allow users to re save all their importers.  It
accounts for tenants if it is a Hyku application.

```sh
bundle exec rake bulkrax:resave_importers
```

lib/tasks/bulkrax_tasks.rake

@@ -141,4 +141,25 @@ namespace :bulkrax do
   rescue => e
     puts "(#{e.message})"
   end
+
+  desc "Update importers"
+  task update_importers: :environment do
+    if defined?(::Hyku)
+      Account.find_each do |account|
+        next if account.name == "search"
+        switch!(account)
+        puts "=============== updating #{account.name} ============"
+
+        update_importers
+
+        puts "=============== finished updating #{account.name} ============"
+      end
+    else
+      update_importers
+    end
+  end
+
+  def update_importers
+    Bulkrax::Importer.all(&:save)
+  end
 end