Extract EE specific files/lines for db/fixtures/development

We have the following files containing EE specific code. We should move them to ee/

• db/fixtures/development/14_pipelines.rb => https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/30870
• db/fixtures/development/20_burndown.rb => https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14766
• db/fixtures/development/22_epics.rb => https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14766

Differences:

db/fixtures/development/14_pipelines.rb

diff --git a/db/fixtures/development/14_pipelines.rb b/home/yorickpeterse/Projects/gitlab/gdk-ee/gitlab/db/fixtures/development/14_pipelines.rb
index db043e39d2c..ffba934021e 100644
--- a/db/fixtures/development/14_pipelines.rb
+++ b/home/yorickpeterse/Projects/gitlab/gdk-ee/gitlab/db/fixtures/development/14_pipelines.rb
@@ -79,7 +79,15 @@ class Gitlab::Seeder::Pipelines
 
   def create_master_pipelines
     @project.repository.commits('master', limit: 4).map do |commit|
-      create_pipeline!(@project, 'master', commit)
+      create_pipeline!(@project, 'master', commit).tap do |pipeline|
+        random_pipeline.tap do |triggered_by_pipeline|
+          triggered_by_pipeline.sourced_pipelines.create(
+            source_job: triggered_by_pipeline.builds.all.sample,
+            source_project: triggered_by_pipeline.project,
+            project: pipeline.project,
+            pipeline: pipeline)
+        end
+      end
     end
   rescue
     []
@@ -231,6 +239,10 @@ class Gitlab::Seeder::Pipelines
     @project.team.users.sample
   end
 
+  def random_pipeline
+    Ci::Pipeline.limit(4).all.sample
+  end
+
   def build_status
     Ci::Build::AVAILABLE_STATUSES.sample
   end