[Catalog] Make bulk enrollment/purchase registration link sent to invited user unique only to that invited user
If utilizing Bulk Enrollment, the intended workflow poses as a problem because the bulk enrollment registration link can work for any user, despite only sending this link to an invited user. For example, an invited user (Student A) receives and then shares/forwards their unique invitation email. The recipient (Student B) can use that to enroll with a different account/email, and Catalog would recognize the invited user (Student A) as the one enrolled and registered in the course. We have to instead inform our students/participants not to share/forward the registration link and to make sure they use the email address that the purchaser used during the invite.
It would be greatly helpful if the registration links sent to invited users are unique only to that user and the email address that was invited. This would help prevent unwanted users from enrolling using someone else's registration link. This would also allow invited users to make sure that they use the email address that was used during the bulk enrollment/purchase invite.
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