Add changelog for pipeline build foreign key

changelogs/unreleased/fix-gb-add-pipeline-builds-foreign-key.yml

+---
+title: Add database foreign key constraint between pipelines and build
+merge_request: 18822
+author:
+type: fixed

spec/support/helpers/migrations_helpers.rb

@@ -34,7 +34,6 @@ module MigrationsHelpers
     end
   end
 
-
   def reset_column_in_all_models
     clear_schema_cache!