[toolforge-deploy] more bug fixes
- chmod before writing to maintain-harbor-common.bash file
- print marker strings for cutting out toolforge_get_versions.sh output
Depends-on: https://gerrit.wikimedia.org/r/c/cloud/wmcs-cookbooks/+/1099777/1
Depends-on: https://gerrit.wikimedia.org/r/c/cloud/wmcs-cookbooks/+/1099776/1
Bug: T358225
Signed-off-by: raymond-ndibe rndibe@wikimedia.org