project import waits on nested gitlab repositories

[ankitm123]

The / in repo name is converted to -, which times out the import command when importing a nested gitlab repo.

error: failed to create Pull Request on the cluster git repository: failed to wait for the Pull Request https://gitlab.com/jx-gitlab-test/cluster/jx3-k3s-gitlab-vault/-/merge_requests/7 to merge: Timed out waiting for pull request https://gitlab.com/jx-gitlab-test/cluster/jx3-k3s-gitlab-vault/-/merge_requests/7 to merge. Waited 20m0s

Related to: jenkins-x/jx#7981