Label events may use cross-project or cross-group references,
if the projects are not accessible by user, we don't show these
label events.

We don't need a repository, and we only need a private user in one
example, so we can scope it locally there.

This will allow us to reuse them in an EE-only spec.

Signed-off-by: Rémy Coutable <remy@rymai.me>