🎁 Adding logic for handling user signin

With this change, we're adding the logic for handling a user
authenticating:

- namely expiring any authorizations that are "expired"
- re-authorizing any work_pids that were provided as part of
  authentication.

Related to:

- #633
- #647

app/models/work_authorization.rb

@@ -54,7 +54,7 @@ def self.handle_signin_for!(user:, authorize_until: 1.day.from_now, work_pid: ni
   #
   # @see .revoke!
   # rubocop:disable Rails/FindBy
-  def self.authorize!(user:, work_pid:, expires_at: 1.day.from_now)
+  def self.authorize!(user:, work_pid:, expires_at: 1.days.from_now)
     work = ActiveFedora::Base.where(id: work_pid).first
     raise WorkNotFoundError.new(user: user, work_pid: work_pid) unless work