Bug fixes

• Fixed error message on user registration by changing field name..
• Automaticallly redirecting affiliate user with the link to user registration page.
• Updating the block link style.

Issue #3141508 by m4olivei, Project Update Bot: Automated Drupal Rector fixes, manual adjustment, coding standards fixes and test fixes

• Drupal 9 compatible.
• Fixed permission issues with earlier Drupal 8 releases.

DEPRECATED DO NOT USE.

#3137567: Remove deprecated method or function for Drupal 9 Compatibility
#3124730: More granular permissions and check out permissions like domain access module
#3151767: Exception: The "DomainEntitySettings::getFormAccess" method is not callable as a _custom_access callback