Library component sidebar: List courses that are using this component

[bradenmacdonald]

As a library content author, I want to see the list of courses in which my team's library components are being used.

[bradenmacdonald]

@sdaitzman @jmakowski1123 @marcotuts Is this the latest mockup? Should we show breadcrumbs (which unit the content is being used in) or just the course name? When clicking on the link, should it take you to the unit where it is used? Should we indicate on this list if the usage in each course is out of date or not, if possible? How should we indicate if the current user doesn't have permission to see the course? CC @navinkarkera