It's cohort-imports not cohort_imports

Somehow we added the path to view cohort imports as '/cohort_imports'. Probably
my fault, as usual.

Jira-Issue: MAV-6734

Author: misaka

config/routes.rb

@@ -134,8 +134,9 @@
     end
   end
 
+  get "/cohort_imports/:id", to: redirect("/cohort-imports/%{id}")
   resources :cohort_imports,
-            path: "cohort_imports",
+            path: "cohort-imports",
             except: %i[index destroy] do
     member do
       get :re_review, to: "cohort_imports#re_review"