Include Link Sanitize tests from D7 contrib module

This is a follow-up to https://www.drupal.org/sa-contrib-2022-034, where we identified that the same vulnerability does not exist in Backdrop core. We would like to include the same sanitization tests, so that we can continue to test sanitization against any future changes to link handling.

GitHub Link:

https://github.com/backdrop/backdrop-issues/issues/5613

GitHub Issue #:

5613

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