Use more reassuring UI and copy for removing payment methods

Summary:
The old treatment was fairly technical. Give this UI a more human-friendly flow:

• Use language "remove" instead of "disable". We keep the record that the card existed around for auditing/historical purposes, but it is no longer a valid payment method going forward and can not be undone. I think this aligns with user expectation and actual behavior better than "disable".
• Only show active methods on the profile screen.

Test Plan:

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D14973