chore: add flipper flag for school (#770)

## Status

- Related to [1236

](RaspberryPiFoundation/digital-editor-issues#1236)
## Points for consideration:

## What's changed?

Sets up the scratch feature on the testing school for the integration
test

Co-authored-by: Chris Zetter <253059100+zetter-rpf@users.noreply.github.com>

Author: DNR500

lib/tasks/test_seeds.rake

@@ -52,6 +52,7 @@ namespace :test_seeds do
         teacher_id = ENV.fetch('SEEDING_TEACHER_ID', TEST_USERS[:john_doe])
 
         school = create_school(creator_id, TEST_SCHOOL)
+        Flipper.enable_actor :cat_mode, school
         verify_school(school)
         assign_a_teacher(teacher_id, school)
 

spec/lib/test_seeds_spec.rb

@@ -48,6 +48,11 @@
       expect(School.find_by(creator_id:).verified_at).to be_truthy
     end
 
+    it 'enables scratch for the school' do
+      school = School.find_by(creator_id:)
+      expect(Flipper.enabled?(:cat_mode, school)).to be(true)
+    end
+
     it 'creates lessons with projects' do
       school = School.find_by(creator_id:)
       expect(SchoolClass.where(school_id: school.id)).to exist