[#65226720] (wip) Creates a SystemStatusService to monitor chorus

 - Checks system status 1x per day
 - Notifies admins if status check indicates license expires in 2 weeks
 - Users cannot create new sessions if status is expired
 - Refresh SystemStatusService after rails initialization
Refactor license specs to instantiate licenses from hashes rather than mocking everything
Moves #expired from SystemStatusService to License model.

 - Optionally pass a date to check expiration on that date as opposed to Date.current
[#65226720] Update license expiration email message.
[#65226720] Display system status warning message in the login view.