Reset Project's column information in...

Reset Project's column information in spec/lib/gitlab/background_migration/populate_merge_request_metrics_with_events_data_spec.rb
Signed-off-by: Rémy Coutable <remy@rymai.me>

spec/lib/gitlab/background_migration/populate_merge_request_metrics_with_events_data_spec.rb

@@ -8,7 +8,7 @@ describe Gitlab::BackgroundMigration::PopulateMergeRequestMetricsWithEventsData,
   end
 
   after do
-    [MergeRequest, MergeRequestDiff].each(&:reset_column_information)
+    [Project, MergeRequest, MergeRequestDiff].each(&:reset_column_information)
   end
 
   describe '#perform' do