CERN Access: Create a reminder with the link to the personal data form

Create a reminder which would remind people of the requirement to fill in the personal data form in order to get the access to the CERN site.

The issue does not name a file, test, entry point, or the personal-data form URL. Start by locating the CERN access plugin’s access or reminder flow and determine where this requirement should be communicated; done means users receive a reminder containing the form link. Confirm the expected trigger and add coverage for the reminder behavior.

Written by the indexing model from the issue text.