Add more logging before a project is destroyed

This adds a simple log message but also allows EE to insert database
events within the transaction (https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6059/diffs).

app/services/projects/destroy_service.rb

@@ -135,6 +135,7 @@ module Projects
           raise_error('Failed to remove some tags in project container registry. Please try again or contact administrator.')
         end
+        log_destroy_event
         trash_repositories!
         # Rails attempts to load all related records into memory before
@@ -148,6 +149,10 @@ module Projects
       end
     end
+    def log_destroy_event
+      log_info("Attempting to destroy #{project.full_path} (#{project.id})")
+    end
+
     ##
     # This method makes sure that we correctly remove registry tags
     # for legacy image repository (when repository path equals project path).