DEV: Add support for various fields in generic bulk importer (#27114)

* user_profiles - `location`
* users - `date_of_birth`
* topics - `pinned_at`, `pinned_until`, `pinned_globally`

This also include changes to correctly import PMs. Currently PM topics
are skipped because of a check in `import_users` step which requires `category_id`
to be present.

script/bulk_import/base.rb

@@ -589,6 +589,8 @@ class BulkImport::Base
     visible
     closed
     pinned_at
+    pinned_until
+    pinned_globally
     views
     subtype
     created_at