Allow package cleanup from admin page (#25307)

Until now expired package data gets deleted daily by a cronjob. The
admin page shows the size of all packages and the size of unreferenced
data. The users (#25035, #20631) expect the deletion of this data if
they run the cronjob from the admin page but the job only deletes data
older than 24h.

This PR adds a new button which deletes all expired data.

![grafik](https://github.com/go-gitea/gitea/assets/1666336/b3e35d73-9496-4fa7-a20c-e5d30b1f6850)

---------

Co-authored-by: silverwind <me@silverwind.io>

services/cron/tasks_basic.go

@@ -152,7 +152,7 @@ func registerCleanupPackages() {
 		OlderThan: 24 * time.Hour,
 	}, func(ctx context.Context, _ *user_model.User, config Config) error {
 		realConfig := config.(*OlderThanConfig)
-		return packages_cleanup_service.Cleanup(ctx, realConfig.OlderThan)
+		return packages_cleanup_service.CleanupTask(ctx, realConfig.OlderThan)
 	})
 }