Move footprint update task placeholder to taskmanager

internal/repository/footprintWorker.go

@@ -1,8 +0,0 @@
-// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
-// All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
-package repository
-
-func (r *JobRepository) footprintWorker() {
-}