Add publish status filter

[jmakowski1123]

As a library user, I want to be able to filter my content by publish status. This includes published, changes since last published, and never published. This filter should be added next to the Tags and Type filter on the library homepage, and each tab.

From the course search modal, this filter should be auto filtered to Published and made visible to users so they see that they are only looking at a view of published content.

[bradenmacdonald]

Early work on this (incomplete): #1406