Add Ticket type notice to Service Desk page

Overview

As part of the move from service desk issues to 1st class "Ticket" types, we should communicate this change to users. As we had to migrate types before enabling the bigger, more exciting changes, we can handle this in two parts:

1. Inform users about the name change (this issue)
2. Showcase new functionality

Proposal

1. Update copy at the top of the Service Desk list page to use "Ticket" in place of "Issue".
2. Add a popover attached to the "Ticket" type on a Ticket detail with the same message.
   1. Appears automatically on page load
   2. Popover should be dismissable. On dismiss, record that the message has been seen and never show it again (ideally saved to profile so it works across logins)
   3. Only logged in users need to see this message

Popover