Change domain block CSV parsing to be more robust and handle more lists (#21470)

* Change domain block CSV parsing to be more robust and handle more lists

* Add some tests

* Improve domain block import validation and reporting

config/locales/en.yml

@@ -441,6 +441,7 @@ en:
         private_comment_description_html: 'To help you track where imported blocks come from, imported blocks will be created with the following private comment: <q>%{comment}</q>'
         private_comment_template: Imported from %{source} on %{date}
         title: Import domain blocks
+      invalid_domain_block: 'One or more domain blocks were skipped because of the following error(s): %{error}'
       new:
         title: Import domain blocks
       no_file: No file selected