CLC-4099 - Updated Canvas::SiteMembershipsMaintainer to filter out invalid SIS Section IDs upon initialization. Added logger for invalid SIS Section IDs.
CLC-4099 - Remove log of non-matching SIS Section IDs
Merge pull request #2835 from redconfetti/CLC-4099-incremental-refresh-bug-3

CLC-4099 - Updated Canvas::SiteMembershipsMaintainer to filter out invalid SIS Section IDs upon initialization