CLC-1451 Add official campus data to My Classes feed

https://jira.media.berkeley.edu/jira/browse/CLC-1451

Since we don't have a campus-sy icon yet, & we haven't yet decided how to display the mix, the "Campus"-emitted classes are currently filtered out of the display.

My preferred option would be to group the "My Classes" by official class data (so that a single "BIOLOGY 1AL" course might contain two bSpace sites and a Canvas site), and then put the course sites which don't have an official campus integration below that list.

Alternatively, we could keep the current site-oriented UX, and add any official classes which _aren't_ feeding bSpace or Canvas as new items (filtering out any official classes which already appear in the LMS sites).