Remove outdated seeds

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

db/fixtures/development/08_wall.rb

-Gitlab::Seeder.quiet do
-  (1..300).each  do |i|
-    # Random Project
-    project = Project.all.sample
-
-    # Random user
-    user = project.users.sample
-
-    next unless user
-
-    user_id = user.id
-
-    Note.seed(:id, [{
-      id: i,
-      project_id: project.id,
-      author_id: user_id,
-      note: Faker::Lorem.sentence(6)
-    }])
-    print('.')
-  end
-end