Fix the Brakeman warnings for unsafe sends and remove the warnings from the ignore list.
Nothing should change in terms of behavior, but we should check that the following still work correctly:
A user can go to their Manage Invitations page (e.g. https://test.archiveofourown.org/users/testy/invitations/manage) and switch between All, Unsent, Used, and Sent But Unused invitations
After enabling the preferences to hide warning and freeform tags by default, a user can still choose to show/hide the tags on blurbs or works
A tag wrangler sees only the correct tags in a given bin, e.g. canonical relationships, synonymous freeform, etc