Revert "Bug 40021: Exempt dannenberg from consensus-health and descriptor checks"

This reverts commit f85b5952.

Andreas got back to us and would like to get information wrt dannenberg
again on the consensus-health mailing list.

However, additional mail in Cc or Bcc seems overkill to him. We'll
address that by deleting his entry in the contact_information.cfg file.

Closes: #40033.