(chore) Remove 'in_review' status from tasks

Tasks cannot currently get into this state, so let's remove it for now.

Author: leeky

app/models/task.rb

@@ -5,9 +5,12 @@ class Task < ApplicationRecord
     state :draft
     state :unstarted, initial: true
     state :in_progress
-    state :in_review
     state :completed
     state :cancelled
+
+    event :completed do
+      transitions from: %i[in_progress], to: :completed
+    end
   end
 
   validates :status, presence: true