remove gitlab token usage

gitlab/prepare.sh

 #!/usr/bin/env bash
 set -e
-service_name="$1"
 . ./gitlab/configure_git.sh
 # git clone --depth 1 https://$service_name:${GIT_ACCESS_TOKEN}@code.schleswig-holstein.de/ozg-cloud/devops/build-management.git ## TODO: use this when MR is merged
 #### TODO: remove code block when MR is merged
-git clone https://common:${GIT_ACCESS_TOKEN}@code.schleswig-holstein.de/ozg-cloud/devops/build-management.git
+git clone https://code.schleswig-holstein.de/ozg-cloud/devops/build-management.git
 cd build-management
 git checkout add-pipeline-scripts
 cd ..