Run global nav link test in review apps
A follow-up from !3267 (merged).
It seems that the rule was applied to the wrong job
I ran a pipeline from a gitlab
MR and the global nav link test job didn't run.
- Downstream pipeline https://gitlab.com/gitlab-org/gitlab/-/pipelines/697635519
- MR gitlab!103228 (merged)
- GitLab Docs pipeline https://gitlab.com/gitlab-org/gitlab-docs/-/pipelines/697733832