[Workbench] Show API token copy-and-paste block in a pop-up accessible from every page
Motivation: I often find myself opening a new shell, going to workbench, clicking on "Manage API tokens" then clicking on "Help" to copy and paste the authentication information into the new shell. This is tedious and interrupts the flow of whatever I was doing. I would like to be able to get that authentication help text on any page, so I don't have to leave the page I'm on or open a new tab.
To avoid embedding the API token into every workbench page by default (although this is currently needed for websockets as well), this could be implemented so it only loads in response to a user click and AJAX call.