add before action for confirmed schemes

app/controllers/schemes_controller.rb

@@ -5,6 +5,7 @@ class SchemesController < ApplicationController
   before_action :authenticate_user!
   before_action :find_resource, except: %i[index]
   before_action :authenticate_scope!
+  before_action :redirect_if_scheme_confirmed, only: %i[primary_client_group confirm_secondary_client_group secondary_client_group support details]
 
   def index
     redirect_to schemes_organisation_path(current_user.organisation) unless current_user.support?
@@ -254,4 +255,8 @@ private
       render_not_found and return
     end
   end
+
+  def redirect_if_scheme_confirmed
+    redirect_to @scheme if @scheme.confirmed?
+  end
 end