maintain-harbor: add a `tools-` prefix to harbor namespaces
Done:
- refactor maintain-harbor code to add
tools-
to harbor namespaces - refactor tests
ToDo:
- create a one-time script to update already existing harbor namespaces from the format "project-1" to "tools-project-1"
Bug: T334657 Signed-off-by: Ndibe Raymond Olisaemeka rolisaemeka-ctr@wikimedia.org