* Onboarding: Invite new users
- Separates the user self-registration and invite cases
- Adds invitation email for users created by the admin
- Adds invitation tokens to verify user was invited
- Adds handler action for invite links
- Refactors `UserEventHostedService`
- Fixes#5726.
* Add permissioned form tag helper
* Better way of changing a user's role
* Test fixes
* Store Emails
* fix test
* Update email rules layout
* Cleanups
* Test cleanups
* Add back comments
* Update view; add test
* Show email rules link even if email settings aren't completed
* Validate email addresses
* No redirect, display warning
* Fix test
* Refactoring: Change email argument types to MailAddress
* Test fix
* Refactoring: Use MailboxAddress
* Parse emails properly in controllers and backend
Co-authored-by: Dennis Reimann <mail@dennisreimann.de>
Co-authored-by: nicolas.dorier <nicolas.dorier@gmail.com>
