Fix compliance violation seeder

* properly gather meta information for MRs

EE: true

ee/spec/factories/compliance_violations.rb

@@ -6,6 +6,11 @@
     reason { :approved_by_merge_request_author }
     merge_request
 
+    merged_at { merge_request.merged_at }
+    target_project_id { merge_request.target_project_id }
+    title { merge_request.title }
+    target_branch { merge_request.target_branch }
+
     trait :approved_by_merge_request_author do
       reason { :approved_by_merge_request_author }
       severity_level { :high }