Remove the review form

Problem/Motivation

The review form checks which user accounts are influenced by a restriction using some database queries, but those queries do not consider the permissions assigned to each user account, with the consequence of showing accounts as affected by a restriction when they are not affected. Furthermore, it assumes the pattern used by the restriction is compatible with the regular expressions used by REGEXP, which would no longer be the case after #3553127: Add more pattern types will be implemented.

Proposed resolution

Remove the review form.