Following recent similar actions done for entities.
Required at this stage to provider better & cleaner helpers
for common user and permission actions to built out permission testing.
Was done for convenience but could potentially be exploited by an
attacker using signing up via one of these routes, then forwarding
an email confirmation to another user so they unknowingly utilise
an account someone else controls.
Tweaks the flow of confirming email, and the user invite flow.
For #3050
