added manual tag for a test (#1460)

test/admin-hpa/features/generate_pupil_pins.feature

@@ -146,7 +146,7 @@ Feature: Generate Pupil PINs
     When a pupil becomes available for pin generation again
     Then I should be able to filter by groups on the generate pins page
 
-  @redis @no_active_check_window
+  @redis @no_active_check_window @manual
   Scenario: Generate Pin Overview page display error if there is no active check window
     Given I am on the generate pupil pins page after logging in with teacher2
     Then I should see an error message stating the service is unavailable