Harbor tool namespaces should have a `tool-` prefix to clearly separate them from the infrastructure components that will be hosted there. This is similar to the `tool-` prefix we are already using with Kubernetes namespaces.
Places that need updating/changing:
* maintain_harbor
** https://gitlab.wikimedia.org/repos/cloud/toolforge/maintain-harbor/-/merge_requests/6
* buildpack-admission-controller (probably https://github.com/toolforge/buildpack-admission-controller/blob/main/pkg/server/validateadmission.go#L57)
* toolforge-cli (probably https://gerrit.wikimedia.org/r/plugins/gitiles/cloud/toolforge/toolforge-cli/+/refs/heads/main/toolforge_cli/build.py#37)
* tools-webservice (probably https://gerrit.wikimedia.org/r/plugins/gitiles/operations/software/tools-webservice/+/refs/heads/master/scripts/webservice#35)