Do not require invited users to confirm their email address
Currently, if a net new invited user accepts an invite to GitLab after registering for GitLab they are required to confirm their email address. This is hurting our accept invite rate as users have to double confirm their email address before entering the GitLab product, see the parent epic for the documented user experience.
We should not require email confirmation for users that have already accepted an invite link as they've already confirmed to us they have access to the email address in question.
- We'll try to implement this by setting a cookie when the user clicks
joinon the invite email with the email as a value. We can then observe that during registration.