Fix the project seed data (#408)

## Status

Ready for review

## What's changed?

- Creates a valid project in CEfE seed data

## Steps to perform after deploying to production

Recreate seed data:

`docker compose run --rm api rails
classroom_management:destroy_seed_data`
`docker compose run --rm api rails
classroom_management:seed_a_school_with_lessons_and_students`

Author: danhalson

lib/tasks/classroom_management_helper.rb

@@ -91,6 +91,9 @@ def create_project(user_id, school, lesson)
       project.school = school
       project.lesson = lesson
       project.locale = 'en'
+      project.project_type = 'python'
+      project.components << Component.new({ extension: 'py', name: 'main',
+                                            content: '' })
     end
   end
 end