Refactor change propogation logic in SchoolLinks, TeacherLinks

When editing an item selected from a list in a popup dialog, we need a way for the changes to be relayed back to the list. In early days this happened by passing the modelInit and modifying it once the update is done.

Newer implementations create a monitored list which detects the change from the http response, which is more flexible.

SchoolLink and TeacherLink are the only places using the older method - getting rid of that means that some unneeded code can get removed from ComponentEditController

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