Add Changelog about temp file removal fix

+ remove whitespace

changelogs/unreleased/pawel-ensure_temp_files_are_deleted_in_fs_metrics-35457.yml

+---
+title: Ensure fs metrics test files are deleted
+merge_request:
+author:

lib/gitlab/health_checks/fs_shards_check.rb

@@ -67,7 +67,6 @@ module Gitlab
           [metric(ok_metric, 0, **labels)]
         end
 
-
         def repository_storages
           @repository_storage ||= Gitlab::CurrentSettings.current_application_settings.repository_storages
         end