Verify email address email
Check out the unit test https://gitlab.com/glitchtip/glitchtip-backend/-/blob/master/users/test.py#L93
Coordinate with @BrendanBerkley on this one since he's been handling most things email.
All the email templates come from https://github.com/pennersr/django-allauth/tree/master/allauth/templates/account/email
So you just need to override them and use the original as a base. The link that they are set to is up for debate. We could just use the default or change it. Since this is not really an API - it doesn't need to be the same as OSS Sentry. The Angular app then needs a routable component that gets the key and sends it to the backend API (as seen in the unit test). The Angular app should show an error message on failure. It should show a success snackbar and redirect somewhere on success (maybe user setting page)