Display generated password reset url in admin interface

As discussed at Backlog Refinement.

We frequently get support requests where users are unable to reset their passwords. While his represents a very small percentage of password resets with the overwhelming majority being successful, it is a frequent reason for contacting support and tends to resolve to an issue outside our control where the reset email is sent, but the receiving server quarantines it rather than rejecting it, so neither the recipient nor sender are aware it has not been delivered.

We cannot improve further on the cause, it is outside our control.

But we can make the process of providing a manual reset smoother and quicker, and potentially something confident admins can do without us, by displaying the password reset link in the admin interface, when a new reset token is generated, rather than requiring admins to build the link themselves from the token.

So the task is a small change to the Admin view, where alongside generating the token, it also then displays the full URL for the token to be used.