Fix Rubocop offenses in YAML processor classes

lib/gitlab/ci/yaml_processor.rb

@@ -21,7 +21,6 @@ module Gitlab
         raise ValidationError, e.message
       end
-
       def builds
         @jobs.map do |name, _|
           build_attributes(name)

spec/lib/gitlab/ci/yaml_processor_spec.rb

@@ -1694,7 +1694,7 @@ EOT
       end
       def pipeline(**attributes)
-         build_stubbed(:ci_empty_pipeline, **attributes)
+        build_stubbed(:ci_empty_pipeline, **attributes)
       end
     end
   end