Add Functionality Allowing Super Admins to Confirm/Unconfirm User Emails

[aaronskiba]

Fixes (Issue exists downstream: https://github.com/portagenetwork/roadmap/issues/1006)

Changes proposed in this PR:

• Include email confirmation status as an editable attribute on the /super_admin/users/:id path.
  • The added logic includes special handling for superadmins. Specifically, it prevents the un-confirming of any already confirmed super admin email.
• This added feature helps address an encountered issue (https://github.com/portagenetwork/roadmap/issues/1005) where some institutions were blocking emails from @portagenetwork.ca, and as a result, preventing users from receiving email confirmation instructions.